Phosphate Checker® (Ultra Low Range) HC - HI774

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Orthophosphates are found in natural waters and wastewaters. They are commonly added to drinking water as a corrosion inhibitor. The instantaneous analysis of orthophosphates by colorimetric  determination provides rapid results using a standard analysis technique.

The Hanna HI774 Checker®HC bridges the gap between simple chemical test kits and professional instrumentation. Chemical test kits are not very accurate and only give only some points resolution, while professional instrumentation can cost hundreds of dollars and can be time-consuming to calibrate and maintain. These Checker HC's are accurate and affordable. The HI774 Checker HC is a simple, accurate, and cost effective way to measure ultra low range phosphates in seawater. HI774 features a resolution of 0.01 ppm and ±0.02 ppm ±5% of reading accuracy. The HI774 Checker HC uses an  adaptation of the Ascorbic Acid method.




Alkalinity, Seawater Range

0.00 to 0.90 ppm


0.01 ppm


±0.02 ppm ±5% of reading


adaptation of Standard Methods for the Examination of Water and Wastewater, 20th edition, Ascorbic Acid method

Battery Type

1.5V AAA / 10,000 hours of continuous use


0 to 50°C (32 to 122°F); RH max 95% non-condensing


after seven minutes of nonuse and two minutes after reading

Photometer/Colorimeter Light Source

LED @ 610 nm

Photometer/Colorimeter Light Detector

silicon photocell


154 x 63 x 30 mm (6.1 x 2.5 x 1.2”)


196 g (6.91 oz.)

Ordering information

HI774 Checker®HC is supplied with sample cuvettes with caps (2), marine phosphate ULR reagent starter kit (reagents for 10 tests), battery, instructions and quick start guide

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