The HI 707 Checker®HC is a simple, accurate, and cost effective way to measure low ranges of nitrite. Designed as a more accurate alternative to chemical test kits, the HI 707 provides quick, accurate results in four easy steps.
The HI 707 uses an adaptation of EPA diazotization method 354.1. The reaction between nitrite and the reagent causes a pink tint in the sample.
Order Information: The HI 707 Checker®HC is supplied with 2 cuvettes and caps, reagent starter kit (6 packets of nitrite LR reagent), 1 x 1.5V AAA battery, and an instruction manual.
Manual: Download
Specification :
| Range | 0 to 600 ppb NO2 -N | |
| Resolution | 1 ppb | |
| Accuracy (@25°C/77°F) | ±20 ppb ± 5% of reading | |
| Measurement Method | Colorimetric | |
| Light Source | Photodiode @470 nm | |
| Light Detector | Silicon photocell | |
| Method | Adaptation of EPA diazotization method 354.1. The reaction between nitrite and the reagent causes a pink tint in the sample. | |
| Power Supply | 1 x 1.5V AAA battery | |
| Power Auto Off | After 10 min. of inactivity | |
| Environment | 0 to 50°C (32 to 122°F); RH max 95% non-condensing | |
| Dimensions | 81.5 x 61 x 37.5 mm (3.2 x 2.4 x 1.5”) | |
| Weight | 64 g (2.25 oz.) |
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The HI 771 Checker®HC is a simple, accurate, and cost effective way to measure ultra-high ranges of chlorine. Designed as a more accurate alternative to chemical test kits, the HI 771 provides quick, accurate results in four easy steps.
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The HI 761 uses an adaptation of the USEPA method 330.5. The reaction between the chlorine and DPD reagent causes a pink tint in the sample.
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Range: 0 to 300 ppb. The HI 749 Checker®HC is a simple, accurate, and cost effective way to measure low ranges of chromium VI in fresh water. Designed as a more accurate alternative to chemical test kits, the HI 749 provides quick, accurate results in four easy steps. The HI 749 uses an adaptation of the ASTM Manual of Water and Environmental Technology, D1687-92, Diphenylcarbohydrazide method. The reaction between chromium VI and the reagent causes a purple tint in the sample.
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Range 0:00 to 2:50 ppm | ascorbic acid method | Resolution 0.01ppm
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Range 0.0 - 99.9 ppm NH3-N | Nessler Method | 0.1ppm resolution
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Range 0:00 to 2:50 ppm | USEPA Method 330.5 / DPD | Resolution 0.01ppm
The HI 93414 measures the most important parameters of drinking water: turbidity and free/total chlorine. Designed for water quality measurements, HI 93414 provides reliable and accurate readings on low turbidity and chlorine values. The HI 93414 meets and exceeds the requirements of USEPA and Standard Methods both for turbidity and colorimetric measurements.
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Reagents for HI 755 Checker HC ®, 25 Tests
081-855-1842
02-541-4199
HI736 Checker HC ® - Phosphorous, ULR 
HI775 Checker HC ® - Alkalinity in fresh water (dKH) 
HI723 Checker HC ® - Chromium VI, HR 
