Nitrate Range: 0.00 to 5.00 ppm (as NO3–)
Nitrate Resolution: 0.01 ppm
Nitrate Accuracy: ±0.25 ppm ±2% of reading @ 25 °C (77 °F)
Nitrate Method: Colorimetric method. The reaction between nitrate and the reagent causes a pink/violet tint in the sample. This checker has been developed to work with seawater samples.
Photometer/Colorimeter Light Source: Light Emitting Diode @ 525 nm
Photometer/Colorimeter Light Detector: Silicon photocell
Battery Type/Life: 1.5V AAA Alkaline
Automatic Shut-Off: After 10 minutes of non-use
Environment: 0 to 50 °C (32 to 122 °F); max. 95% RH non-condensing
Weight: 64 g (2.3 oz)
Dimensions: 86.0 x 61.0 x 37.5 mm (3.4 x 2.4 x 1.5”)
Ordering Information: HI781 Checker HC is supplied with sample cuvettes with caps (2), nitrate reagent starter kit (reagents for 25 tests), filter holder, 10 mL syringe, 5 mL syringe with tip, mixing vial with cap, battery, and instructions.