Hanna HI781 Nitrate LR checker (Marine)

Hanna HI781 Nitrate LR checker measures nitrate in the range of 0-5ppm (0-50ppm after dilution) in marine water

Nitrates occur naturally due to the decomposition of organic microorganisms or the use of fertilizers. When nitrate is reduced to nitrite, it can bind easily to form substances that are harmful to both humans and animals. A maximum concentration level of 45 mg/l has been established worldwide for nitrate in water.

The HI781 Checker offers a simple, accurate, and cost-effective solution for measuring nitrate in seawater. It was developed as a reliable alternative to traditional chemical test kits, providing fast and dependable measurement results in just a few straightforward steps. Designed for comfort, the checker is easy to hold, portable, and features a large display for effortless reading.

• More accurate than chemical test kits
• Practical pocket size
• Clearly readable display
• Simple one-button operation
• Automatic shutdown feature
• Operates on a single AAA battery

Specifications HI781

• Application: sea water
• Range: 0.00 to 5.00 ppm (NO3) and 0-50 ppm after dilution with nitrate-free seawater (NOT included)
• Resolution: 0.01 ppm
• Accuracy: ± 0.25 ppm ± 2% of reading at 25 °C
• Light source: LED at 525 nm
• Light detector: silicone photocell
• Method: colorimetric
• Environment: 0 to 50 °C, RH max. 95% non-condensing
• Battery: 1 x 1.5 V AAA
• Automatic shut-off after 10 minutes of non-use
• Dimensions: 86.0 x 61.0 x 37.5 mm
• Weight: 64 g

If you would like to use the HI781 nitrate test for measuring nitrate levels above 5 ppm, you can dilute the water sample with nitrate-free seawater. This can be easily prepared by mixing osmosis water with a small amount of sea salt.

Explanation for measurements above 5ppm