HI781

Marine Nitrate Low Range Checker® HC

$67.99

The HI781 Marine Nitrate Low Range Colorimeter is designed to accurately determine low range nitrate levels in saltwater aquariums and marine applications. With a digital read out, there is no more struggling to determine colors visually.

Range: 0.00 to 5.00 ppm (as NO3–) [0.0 to 50.0 ppm (calculated) using dilution]
Built-in timer so you don't miss a step.
Saltwater Compatible

*Products classified as Dangerous Goods can only be shipped via ground.

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The HI781 Checker^®HC (Handheld Colorimeter) is a simple, accurate, and cost-effective way to measure nitrate from 0.00 to 5.00 ppm (as NO3–) in your saltwater aquarium. For samples containing 5.0 to 50.0 ppm nitrate, follow the approved dilution procedure.

Nitrate is a by-product of the Nitrogen cycle. Excessive amounts of nitrates in a reef aquarium can promote the growth of undesirable organisms including algae and dinoflagellates while insufficient amounts can lead to starvation in which SPS and other corals will show signs including the loss of color and paleness.

The HI781 Nitrate Checker HC is a handheld colorimeter that uses the Beer-Lambert principle to determine the concentration of nitrate colorimetrically. The HI781 is designed specifically to measure low levels of nitrate in a saltwater aquarium.

Features at-a-glance:

For use with saltwater samples.
More accurate than chemical test kits.
Dedicated to a single parameter.
Small size, big convenience.
No errors with a digital readout.
Ideal for aquariums and marine biology applications.
For samples containing 5-50 ppm nitrate, follow the dilution procedure.

See What Others are Saying

Never Going Back

Extra Step not a problem for me. More important to get an accurate reading. Have had problems in the past with standard nitrate test kits being wrong. I am never going back.

Robert D. Verified Buyer

Awesome!

Once you get the steps down it’s pretty easy. I love this and I am so glad I have some thing that gives me an accurate measurement.

Ben G. Verified Buyer

Lots of steps, but more accurate than guessing colors.

This removes the guessing game and gives a much more precise number.

B Dubs. Verified Buyer

Resources

Specifications

Specification Name	Detail
SKU	HI781
Range	0.00 to 5.00 ppm (as NO3–) 0.0 to 50.0 ppm (calculated) using dilution
Resolution	0.01 ppm
Accuracy @ 25°C (77°F)	±0.25 ppm ±2% of reading @ 25 °C (77 °F) ±2.5 ppm ± 5% of calculated reading using dilution
Light Source	LED @ 525 nm
Light Detector	silicon photocell
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.
Battery Type	(1) 1.5V AAA
Auto shut-off	after ten minutes of non-use
Environment	0 to 50°C (32 to 122°F); RH max 95% non-condensing
Dimensions	86.0 x 61.0 x 37.5 mm (3.4 x 2.4 x 1.5”)
Weight	64 g (2.3 oz)
Ordering Information	Each HI781 is delivered in a case with custom insert and is supplied with: Marine Nitrate Low Range reagent starter kit (reagents for 25 tests), Sample cuvette and cap (2 pcs.), Filter paper (25 pcs.), Filter holder (1 pc.), Mixing vial and cap (1 pc.), 5 mL syringe with tip (1 pc.), 10 mL syringe (1 pc.), 1 mL graduated syringe (1 pc.), Plastic refilling pipette (1 pc.), 16 gauge blunt needle (1 pc.), 1.5V AAA Alkaline battery (1 pc.), and Instruction manual.
Reagent Set	HI781-25 (25 tests)
Calibration Check	HI781-11
Warranty	1 year

Manual

HI781 Instructions Download
FAQ

Type Country Document

Frequently Asked Questions (FAQ) US Download
SDS

Product Code Country SDS Sheet

HI781A-0 US Download

HI781B-0 US Download

HI781C-0 US Download