Best Portable Photometer out of top 16

 

Hanna Instruments HI96770-01 Standard Reagent For High Range Silica Portable Photometers 100 Test

Hanna Instruments HI96770-01 Standard Reagent, For High Range Silica Portable Photometers, 100 Test

Hanna Instruments HI96770-01 Standard Reagent, For High Range Silica Portable Photometers, 100 Test - For 100 test. Standard reagent kit for high range silica portable photometers.

 

Hanna Instruments HI96741 Low Range Total Hardness and Iron Portable Photometer with Sample Cuvettes 7-1932 Length x 4-332 Width x 2-1116 Height 9V Battery

Hanna Instruments HI96741 Low Range Total Hardness and Iron Portable Photometer with Sample Cuvettes, 7-19/32″ Length x 4-3/32″ Width x 2-11/16″ Height, 9V Battery

Hanna Instruments HI96741 Low Range Total Hardness and Iron Portable Photometer with Sample Cuvettes, 7-19/32″ Length x 4-3/32″ Width x 2-11/16″ Height, 9V Battery - Hardness is a consequence of the type of rock layers which the water passes through and of its permanence in the water bearing stratum. +/-0. Adaptation of tptz method. Hi96741 is supplied with 2 sample cuvettes with caps, 9v battery and instruction manual. By passing through various layers of soil and rocks, rain water dissolves some of the mineral substances. Hardness can cause pipe rusting in water heating and cooling systems, reverse osmosis and demineralization plants. 01 milligrams per liter +/-8 percent of reading iron lr at 25 degree c accuracy. It can also increase the consumption of soaps and detergents in industrial washing machines or laundries. Hardness, on the other hand, is indicative of the presence of calcium and magnesium in water. Hi96741 can provide critical measurements of low range iron and total hardness (magnesium and calcium). It can also stain laundry, damage kitchenwares and favor the growth of certain bacteria. 0 to 50 degree c (32 to 122 degree f) rh maximum 95 percent non-condensing environment. 00 to 4. With the portable hi 96741 you can monitor both iron and hardness levels. Measures 7. In domestic water, iron can alter the taste and make it unpleasant to drink. 6″ length by 4. Silicon photocell with narrow band interference filter at 525nm light detector. 70 milligrams per liter (ppm) total hardness and 0 to 1. However, low levels of iron are critical in beverage production. 60 milligrams per liter (ppm) iron lr range. 01 milligrams per liter total hardness and iron lr resolution. 7″ height. 1″ width by 2. Auto-off after ten minutes of non-use in measurement mode, after one hour of non-use in calibration mode with last reading reminder. 11 milligrams per liter +/-5 percent of reading total hardness and +/-0. The iron concentration in water needs to be monitored since it can become harmful above certain levels. Tungsten lamp.

 

Hanna Instruments HI96725C Cyanuric Acid and pH Chlorine Portable Photometer Kit

Hanna Instruments HI96725C Cyanuric Acid and pH Chlorine Portable Photometer Kit

Hanna Instruments HI96725C Cyanuric Acid and pH Chlorine Portable Photometer Kit - Cyanuric acid and ph chlorine portable photometer kit. Auto-off after ten minutes of non-use in measurement mode after one hour of non-use in calibration mode with last reading reminder. 9v battery power supply. 0 to 50 degree c (32 to 122 degree f) rh maximum 95 percent non-condensing environment. Silicon photocell with narrow band interference filter at 525nm light detector.

 

Hanna Instruments HI96716 Bromine Portable Photometer with Sample Cuvettes 7-1932 Length x 4-332 Width x 2-1116 Height 000 - 1000mgL 001mgL Resolution 9V Battery

Hanna Instruments HI96716 Bromine Portable Photometer with Sample Cuvettes, 7-19/32″ Length x 4-3/32″ Width x 2-11/16″ Height, 0.00 – 10.00mg/L, 0.01mg/L Resolution, 9V Battery

Hanna Instruments HI96716 Bromine Portable Photometer with Sample Cuvettes, 7-19/32″ Length x 4-3/32″ Width x 2-11/16″ Height, 0.00 – 10.00mg/L, 0.01mg/L Resolution, 9V Battery - 9v battery power supply. 6″ length by 4. 00 milligrams per liter (ppm) range. 00, 10. The hi96716 meter measures the bromine content in water samples in the 0. 00 milligrams per liter range. The hi96 series portable photometers use an exclusive positive-locking system to ensure that the cuvette is in the same place every time it is placed into the measurement cell. 01 milligrams per liter resolution. Measures 7. In many countries, bromine sanitizing has been introduced as an alternative for chlorine. Adaptation of the standard methods for the examination of water and wastewater, 20th edition, dpd method. 7″ height. Auto-off after 10 minutes of non-use in measurement mode after 1 hour of non-use in calibration mode with last reading reminder. Tungsten lamp. 0, 50 degree c (32 to 122 degree f) rh maximum 95 percent non-condensing environment. Silicon photocell with narrow band interference filter at 525nm light detector. Although it is not as strong as chlorine, bromine remains stable at higher temperatures (advantageous for heated pools and hot tubs), and higher ph levels. Furthermore, it has little reaction to nitrogen compounds, thus reducing the unpleasant odor and eye irritation problems associated with pool water sanitation. The main disadvantage of bromine is the slower acting disinfecting power, making it less suitable for larger pools. +/-0. 00 to 10. 08 milligrams per liter (ppm) +/-3 percent of reading at 25 degree c accuracy. 1″ width by 2.

 

Hanna Instruments HI96723 High Range Chromium VI Portable Photometer with Sample Cuvettes 7-1932 Length x 4-332 Width x 2-1116 Height 0 - 1000 microgramL 1 microgramL Resolution 9V Battery

Hanna Instruments HI96723 High Range Chromium VI Portable Photometer with Sample Cuvettes, 7-19/32″ Length x 4-3/32″ Width x 2-11/16″ Height, 0 – 1000 microgram/L, 1 microgram/L Resolution, 9V Battery

Hanna Instruments HI96723 High Range Chromium VI Portable Photometer with Sample Cuvettes, 7-19/32″ Length x 4-3/32″ Width x 2-11/16″ Height, 0 – 1000 microgram/L, 1 microgram/L Resolution, 9V Battery - +/-5micro g/l +/-4 percent of reading at 25 degree c accuracy. 6″ length by 4. 9v battery. Measures 7. Adaptation of the astm manual of water and environmental technology, d1687-92, diphenylcarbohyzide method. Silicon photocell with narrow band interference filter at 525nm light detector. 7″ height. 0, 1000 microgram/l range. After 10 minutes of non-use in measurement mode after 1 hour of non-use in calibration mode with last reading reminder auto-shut off. 0, 50 degree c (32 to 122 degree f) rh maximum 95 percent non-condensing environment. The meter uses an exclusive positive-locking system to ensure that the cuvette is in the same position every time it is placed into the measurement cell. The hi96723 meter measures the hexavalent chromium (cr vi) content in water and waste waters samples. Hi96723 is supplied with 2 sample cuvettes with caps, 9v battery and instruction manual. The reaction between cr vi and reagents causes a purple tint in the sample. 1″ width by 2. In addition, it has certain qualities that make it useful in the production processes of the textile industry. Tungsten lamp. For this reason, it plays an important role in the plating industry as well as cooling towers. 1microgram/l (ppm) resolution. At normal temperatures chromium is corrosion-resistant.

 

Hanna Instruments HI96731 Zinc Portable Photometer with Sample Cuvettes 7-1932 Length x 4-332 Width x 2-1116 Height 000 - 300mgL 001mgL Resolution 9V Battery

Hanna Instruments HI96731 Zinc Portable Photometer with Sample Cuvettes, 7-19/32″ Length x 4-3/32″ Width x 2-11/16″ Height, 0.00 – 3.00mg/L, 0.01mg/L Resolution, 9V Battery

Hanna Instruments HI96731 Zinc Portable Photometer with Sample Cuvettes, 7-19/32″ Length x 4-3/32″ Width x 2-11/16″ Height, 0.00 – 3.00mg/L, 0.01mg/L Resolution, 9V Battery - 00 to 3. 1″ width by 2. Hi96731 is supplied with 2 sample cuvettes with caps, 9v battery and instruction manual. Silicon photocell with narrow band interference filter at 575nm light detector. 6″ length by 4. Zinc is normally introduced into drinking water through industrial effluents, especially due to dezincification of brass and deterioration of galvanized iron. 0 to 50 degree c (32 to 122 degree f) rh maximum 95 percent non-condensing environment. The cuvette has a very important role because it is an optical element and thus requires particular attention. In addition to drinking water, zinc is measured in surface finishing, boilers and cooling towers, water conditioning, effluent waters and many others. 00 milligrams per liter ph range. The meter uses an exclusive positive-locking system to ensure that the cuvette is in the same place every time it is placed into the measurement cell. 01 milligrams per liter ph resolution. 00 milligrams per liter (ppm) range. 03 milligrams per liter +/-3 percent of reading at 25 degree c accuracy. The hi96731 measures the zinc content in water and wastewater in the 0. It is important that both, the measurement and the calibration (zeroing) cuvettes, are optically identical to provide the same measurement conditions. Auto-shut off after ten minutes of non-use in measurement mode, after one hour of non-use in calibration mode with last reading reminder. Measures 7. Tungsten lamp. 7″ height. +/-0. 00 to 3. Adaptation of the standard methods for the examination of water and wastewater, 20th edition, zircon method.

 

Hanna Instruments HI96771 Ultra High Range Free Chlorine Portable Photometer with Sample Cuvettes 7-1932 Length x 4-332 Width x 2-1116 Height 0 - 500 mgL UHR 9V Battery

Hanna Instruments HI96771 Ultra High Range Free Chlorine Portable Photometer with Sample Cuvettes, 7-19/32″ Length x 4-3/32″ Width x 2-11/16″ Height, 0 – 500 mg/L UHR, 9V Battery

Hanna Instruments HI96771 Ultra High Range Free Chlorine Portable Photometer with Sample Cuvettes, 7-19/32″ Length x 4-3/32″ Width x 2-11/16″ Height, 0 – 500 mg/L UHR, 9V Battery - 03 milligrams per liter +/-3 percent of reading for free chlorine and +/-3 milligrams per liter +/-3 percent of reading for chlorine uhr at 25 degree c accuracy. Hi96771 has been developed to check chlorine dosing in disinfection processes with ultra high concentrations of chlorine. The methods are an adaptation of standard methods for the examination of water and wastewater, 20th edition, 4500-cl. 00 to 3. +/-0. 50 milligrams per liter 0. 01 milligrams per liter from 0. Tungsten lamp. Free chlorine 0. 50 milligrams per liter and chlorine uhr 1 milligrams per liter from 0, 200 milligrams per liter 10 milligrams per liter above 200 milligrams per liter resolution. Free chlorine 0. Silicon photocell with narrow band interference filter at 466nm light detector. The meter uses an exclusive positive-locking system to ensure that the cuvette is in the same position every time it is placed into the measurement cell. The extended range from 0 to 500 milligrams per liter (ppm), it is ideal for the food industry, such as in fruit and vegetable washing. The cuvette is made from special optical glass to obtain best results. 00 milligrams per liter, chlorine uhr 0 to 500 milligrams per liter range. 00 to 5. The hi96771 meter measures the free chlorine content in water samples and chlorine ultra high range. 10 milligrams per liter above 3. Auto-off after 10 minutes of non-use in measurement mode, after 1 hour of non-use in calibration mode with last reading reminder. Hi96771 is supplied with 2 sample cuvettes with caps, 9v battery and instruction manual. It is designed to fit a cuvette with a larger neck making it easier to add both sample and reagents. 0 to 50 degree c (32 to 122 degree f) rh maximum 95 percent non-condensing environment. Measures 7-19/32″ length x 4-3/32″ width x 2-11/16″ height.

 

Hanna Instruments HI96750 Potassium Portable Photometer with Sample Cuvettes 7-1932 Length x 4-332 Width x 2-1116 Height 10 to 100mgL 1mgL MR Resolution 9V Battery

Hanna Instruments HI96750 Potassium Portable Photometer with Sample Cuvettes, 7-19/32″ Length x 4-3/32″ Width x 2-11/16″ Height, 10 to 100mg/L, 1mg/L MR Resolution, 9V Battery

Hanna Instruments HI96750 Potassium Portable Photometer with Sample Cuvettes, 7-19/32″ Length x 4-3/32″ Width x 2-11/16″ Height, 10 to 100mg/L, 1mg/L MR Resolution, 9V Battery - The hi96750 measures the potassium (k) content in water samples in the 0. Tetraphenylborate method. The reaction between potassium and reagents causes turbidity in the sample. 6″ length by 4. Measures 7. Hi96750 uses an exclusive positive-locking system to ensure that the cuvette is in the same place every time it is placed into the measurement cell. 0 to 10. 0 milligrams per liter lr and 10 to 100 milligrams per liter mr range, 0. Potassium concentration is important in determining the quality of soil in many greenhouse, agriculture and horticulture applications. 5 milligrams per liter +/-7 percent of reading at 25 degree c accuracy. 0 milligrams per liter (ppm) for low range and 10 to 100 milligrams per liter (ppm) for medium range. 1″ width by 2. +/-1. Silicon photocell with narrow band interference filter at 466nm light detector. Potassium salts are also a common component of fertilizers. 0 to 50 degree c (32 to 122 degree f) rh maximum 95 percent non-condensing environment. Potassium as a chemical element is commonly found in nature. The hi 96750 uses the tetraphenylborate method. It is present in soil and drinking water and is also an essential element for the growth of plants and animals. 1 milligrams per liter lr and 1 milligrams per liter mr resolution. 7″ height. Light emitting diode. 0 to 10. Battery type / life approximately 40 hours of continuous use, auto-off after 10 minutes of non use life.

 

Hanna Instruments HI96771C Ultra High Range Free Chlorine Portable Photometer Kit

Hanna Instruments HI96771C Ultra High Range Free Chlorine Portable Photometer Kit

Hanna Instruments HI96771C Ultra High Range Free Chlorine Portable Photometer Kit - Silicon photocell with narrow band interference filter at 466nm light detector. Ultra high range free chlorine portable photometer kit. The extended range from 0 to 500mg/l (ppm), it is ideal for the food industry, such as in fruit and vegetable washing. Auto-off after 10 minutes of non-use in measurement mode, after 1 hour of non-use in calibration mode with last reading reminder. It is designed to fit a cuvette with a larger neck making it easier to add both sample and reagents.

 

Hanna Instruments HI96735 EPA Total Hardness Portable Photometer with Sample Cuvettes 7-1932 Length x 4-332 Width x 2-1116 Height 400 - 750mgL 50mgL Resolution 9V Battery

Hanna Instruments HI96735 EPA Total Hardness Portable Photometer with Sample Cuvettes, 7-19/32″ Length x 4-3/32″ Width x 2-11/16″ Height, 400 – 750mg/L, 5.0mg/L Resolution, 9V Battery

Hanna Instruments HI96735 EPA Total Hardness Portable Photometer with Sample Cuvettes, 7-19/32″ Length x 4-3/32″ Width x 2-11/16″ Height, 400 – 750mg/L, 5.0mg/L Resolution, 9V Battery - 0 to 50 degree c (32 to 122 degree f) rh maximum 95 percent non-condensing environment. 0 milligrams per liter from 100 to 750 milligrams per liter resolution. Hardness can also cause scaling of pipes in cooling and heating systems. Total hardness, that is the presence of magnesium and calcium, is due mainly to the runoff water dissolving these salts as it flows or filters through different strata. Adaptation of the epa recommended method 130. Lr 0, 250 milligrams per liter mr 200 to 500 milligrams per liter hr 400 to 750 milligrams per liter range. 0 milligrams per liter from 1 to 100 milligrams per liter 5. Lr +/-5 milligrams per liter +/-4 percent of reading at 25 degree c mr +/-7 milligrams per liter +/-3 percent of reading at 25 degree c hr +/-10 milligrams per liter +/-2 percent of reading at 25 degree c accuracy. This meter uses an exclusive positive-locking system to ensure that the cuvette is in the same position every time it is placed into the measurement cell. Auto-shut off after ten minutes of non-use in measurement mode, after one hour of non-use in calibration mode with last reading reminder. Light emitting diode. 1″ width by 2. The cuvettes are made from special optical glass to obtain best results. 1. 7″ height. Hi96735 is supplied with 2 sample cuvettes with caps, 9v battery and instruction manual. The hi93735 measures the total hardness in drinking, surface and wastewater. Silicon photocell with narrow band interference filter at 466nm light detector. It is designed to fit cuvettes with a larger neck making it easier to add both sample and reagents. 1. Measures 7. 6″ length by 4.

 

Hanna Instruments HI96710 FreeTotal Chlorine and pH Portable Photometer 7-1932 Length x 4-332 Width x 2-1116 Height 65 to 85 pH 01 pH 001 mgL Resolution LCD Display 9V

Hanna Instruments HI96710 Free/Total Chlorine and pH Portable Photometer, 7-19/32″ Length x 4-3/32″ Width x 2-11/16″ Height, 6.5 to 8.5 pH, 0.1 pH, 0.01 mg/L Resolution, LCD Display, 9V

Hanna Instruments HI96710 Free/Total Chlorine and pH Portable Photometer, 7-19/32″ Length x 4-3/32″ Width x 2-11/16″ Height, 6.5 to 8.5 pH, 0.1 pH, 0.01 mg/L Resolution, LCD Display, 9V - Certified calibration and verification standards. Glp features. The meter uses an exclusive positive-locking system to ensure that the cuvette is in the same position every time it is placed into the measurement cell. It is designed to fit a cuvette with a larger neck making it easier to add both sample and reagents. Timer function. User calibration. All instruments are factory calibrated and the electronic and optical design minimizes the need of frequent calibration. The meter has an auto-shut off feature that will turn off the instrument after 10 minutes of non use in measurement mode or after 1 hour if left in calibration mode. Display messages aid the user in routine operation. The cuvette is made from special optical glass to obtain best results. Auto shut-off. This makes the instruments fulfill field applications. The hi 96710 is an auto diagnostic portable microprocessor meter that benefits from hanna’s years of experience as a manufacturer of analytical instruments. Beps (battery error prevention system). It has the advanced optical system based on a special tungsten lamp and a narrow band interference filter that allows most accurate and repeatable readings. Cal check. With the powerful cal check validation function, you are able to validate good performance of your instrument at any time. The validation procedure is extremely user friendly. All instruments are splash waterproof and the lamp and filter units are protected from dust or dirt by a transparent cup. Just use the exclusive hanna ready-made, nist traceable standards to verify the performance of the instrument and recalibrate if necessary. Hanna has developed the hi 96710 to measure ph, free chlorine and total chlorine three critical parameters to ensure good water quality.

 

Hanna Instruments HI96716C Cal Check Bromine Portable Photometer Kit with Case

Hanna Instruments HI96716C Cal Check Bromine Portable Photometer Kit with Case

Hanna Instruments HI96716C Cal Check Bromine Portable Photometer Kit with Case - Beps (battery error prevention system). User calibration. Auto-off after 10 minutes of non-use in measurement mode after 1 hour of non-use in calibration mode with last reading reminder. The main disadvantage of bromine is the slower acting disinfecting power, making it less suitable for larger pools. Measures 7-19/32″ length by 4-3/32″ width by 2-11/16″ height. Method adaptation of the standard methods for the examination of water and wastewater, 20th edition, dpd method. Timer function. 00 milligrams per liter. Accuracy +/-0. Certified calibration and verification standards. Light detector silicon photocell with narrow band interference filter at 525 nm. Power supply 9v battery. Glp features. Range, freechlorine 0. 08 milligrams per liter (ppm) +/-3 percent of reading at 25 degree celsius. Light source tungsten lamp. Environment 0 to 50 degree celsius (32 to 122 degree fahrenheit) rh max 95 percent non-condensing. The hi 96 series portable photometers use an exclusive positive-locking system to ensure that the cuvette is in the same place every time it is placed into the measurement cell. Auto shut-off. 00 to 10. Although it is not as strong as chlorine, bromine remains stable at higher temperatures (advantageous for heated pools and hot tubs), and higher ph levels. In many countries, bromine sanitizing has been introduced as an alternative for chlorine. Resolution 0. 01 milligrams per liter. Furthermore, it has little reaction to nitrogen compounds, thus reducing the unpleasant odor and eye irritation problems associated with pool water sanitation.

 

Hanna Instruments HI96720C Calcium Hardness ISM Standard Method Portable Photometer Kit

Hanna Instruments HI96720C Calcium Hardness ISM Standard Method Portable Photometer Kit

Hanna Instruments HI96720C Calcium Hardness ISM Standard Method Portable Photometer Kit - Silicon photocell with narrow band interference filter at 525nm light detector. Calcium hardness standard method portable photometer kit. Also includes instrument quality certificate, instruction manual, rigid carrying case. Waterproof hardness ism. Kit includes photometer, 2 sample cuvettes with caps, 9v battery, 1 ml syringe with tip, cloth for wiping cuvettes.

 

Hanna Instruments HI96713C Low Range Phosphate Portable Photometer Kit

Hanna Instruments HI96713C Low Range Phosphate Portable Photometer Kit

Hanna Instruments HI96713C Low Range Phosphate Portable Photometer Kit - Phosphates are also utilized in detergents and are needed, in small quantities, for heating systems. High concentrations of phosphates can cause environmental pollution as they are a primary cause of eutrophication. Kit includes photometer, 2 sample cuvettes with caps, 9v battery, scissors, cloth for wiping cuvettes, instrument quality certificate, instruction manual and rigid carrying case. Phosphates are particularly important for the growth and development of plant roots, and hence are one of the most common fertilizers used in agriculture. Low range phosphate portable photometer kit.

 

Hanna Instruments HI96104 Cal Check pH FreeTotal Chlorine and Cyanuric Acid Portable Photometer 7-1932 Length x 4-332 Width x 2-1116 height 65 to 85 pH 01 pH Resolution LCD Display 9V

Hanna Instruments HI96104 Cal Check pH, Free/Total Chlorine and Cyanuric Acid Portable Photometer, 7-19/32″ Length x 4-3/32″ Width x 2-11/16″ height, 6.5 to 8.5 pH, 0.1 pH Resolution, LCD Display, 9V

Hanna Instruments HI96104 Cal Check pH, Free/Total Chlorine and Cyanuric Acid Portable Photometer, 7-19/32″ Length x 4-3/32″ Width x 2-11/16″ height, 6.5 to 8.5 pH, 0.1 pH Resolution, LCD Display, 9V - 01 milligrams per liter cl, free, 0. 1 milligrams per liter +/-15 percent of reading cya. In swimming pools, spas and similar applications, cyanuric acid helps to stabilize the breakdown of chlorine, especially in sunlight. 01 milligrams per liter cl, total, 1 milligrams per liter (ppm) cya. 1 ph, 0. The hi 96104 meter measures ph, free and total chlorine and cyanuric acid content in water and wastewater. Measures 7-19/32″ length by 4-3/32″ width by 2-11/16″ height. Method ph phenol red method, chlorine adaptation of the epa recommended dpd method 330. 00 to 5. Timer function. Accuracy at 25 degree celsius +/-0. Environment 0 to 50 degree celsius (32 to 122 degree fahrenheit) rh max 95 percent non-condensing. 03 milligrams per liter +/-3 percent of reading cl, total, +/-0. 00 milligrams per liter (ppm) cl, total, 0 to 80 milligrams per liter (ppm) cya. 00 to 5. Chlorine is the most common water disinfectant used in many swimming pools and spas. Frequent testing of both cyanuric acid and ph will help to minimize chlorine consumption. User calibration. Specifically designed for swimming pool and spa applications, the hi 96104 measures ph, free and total chlorine and cyanuric acid content. Cal check. Resolution 0. Light detector silicon photocell with narrow band interference filter at 525 nm. 5 ph, 0. Power supply 9v battery. 00 milligrams per liter (ppm) cl, free, 0. 5 to 8. Beps (battery error prevention system). Glp features. Auto-off after ten minutes of non-use in measurement mode after one hour of non-use in calibration mode with last reading reminder. 5, cya adaptation of the turbidimetric method. Certified calibration and verification standards. The reagents are in powder and liquid form depending on the parameter and they are supplied in dropper bottles and packets. Light source tungsten lamp. 03 milligrams per liter +/-3 percent of reading cl, free, +/-0. 1 ph, +/-0. Auto shut-off. Range6.

 

Hanna Instruments HI96710C FreeTotal Chlorine and pH Portable Photometer Kit

Hanna Instruments HI96710C Free/Total Chlorine and pH Portable Photometer Kit

Hanna Instruments HI96710C Free/Total Chlorine and pH Portable Photometer Kit - Kit includes photometer, hard carrying case, 2 sample cuvettes, scissors, cuvette cleaning cloth, battery and instruction manual. Free/total chlorine and ph portable photometer kit. 9v battery power supply. Auto-off after ten minutes of non-use in measurement mode, after one hour of non-use in calibration mode, with last reading reminder. Tungsten lamp silicon photocell with narrow band interference filter at 525nm light detector.





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