Product Description Our HI774 Ultra Low Range Phosphate Checker will be essentially the same specifications as the HI736 Ultra Low Range Phosphorus Checker however it will not require a conversion but read directly in parts per million phosphates compared to parts per billion phosphorus. The HI774 Ultra Low Range Phosphate Checker HC (Handheld Colorimeter) provides a simple, accurate and cost-effective way to measure phosphate in marine systems including reef tanks. Phosphate is an important parameter to measure in aquaculture and aquariums; levels that are too high can lead to extensive algae growth, depleted dissolved oxygen levels, and ultimately can be fatal to many types of fish and aquatic life. Designed as a more accurate alternative to chemical test kits, the HI774 provides quick, accurate results in a few easy steps. Features at-a-glance: Easier to use and more accurate than chemical test kits Dedicated to a single parameter Small size, big convenience Ideal for: Aquariums, Environmental, Aquaculture, Water Quality SKU HI774 Range 0.00 to 0.90 ppm Resolution 0.01 ppm Accuracy @ 25°C/77°F ±0.02 ppm ±5% of reading Light Source LED @ 525 nm Light Detector silicon photocell Method adaptation of the Standard Methods for the Examination of Water and Wastewater, 20th edition, Ascorbic-Acid method Battery Type (1) 1.5V AAA Auto-off after 7 minutes of non-use and 2 minutes after reading 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 HI774 Checker®HC is supplied with (2) sample cuvettes with caps, phosphate ULR reagent starter kit for 10 tests, batteries, instructions, and quick start guide. Reagent Set HI774-25 Calibration Set HI774-11 Warranty 1 year

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Product Description The HI764-25 are the replacement reagents for the HI764 Nitrite Ultra Low Range Checker® HC. These high-quality reagents are manufactured in our state-of-the-art facility and are clearly marked with the lot number and expiration date on each packet for traceability. Pre-made reagents for ease of use Prepared with high purity chemicals Marked with expiration date and lot number for traceability

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Product Description Nitrification is the biological oxidation of ammonia (ammonium ion) into nitrite followed by the oxidation of the nitrites to nitrates. The first step of this 2-step process is carried out in an aquarium by nitrifying bacteria. During this quick process, the ammonium levels drop while the nitrite levels increase. Since nitrite is just as harmful as ammonia, nitrite levels should be maintained at immeasurable levels. A mature biological filter should be able to keep nitrite levels low.Also, if tap water is to be used in an aquarium, it is recommended that it be tested for phosphate, as well as silicate, ammonia, nitrate, nitrite, pH, and alkalinity.The HI764 Checker® Handheld Colorimeter bridges the gap between simple chemical test kits and professional instrumentation. Chemical test kits are not very accurate, while professional instrumentation can cost hundreds of dollars and can be time-consuming to calibrate and maintain. Hanna Checker®’s are accurate, affordable and easy to use.To begin measurements, first, zero the instrument with your water sample. Next, add the reagent. Last, place the vial into the Checker®, press the button and read the results. It’s that easy.The contoured style of these Checker®’s fit in your palm and pocket perfectly and the large LCD is easy to read. The auto shut-off feature assures the battery life will not be drained if you forget to turn it off. Features at-a-glance: Easier to use and more accurate than chemical test kits Dedicated to a single parameter Small size, big convenience Ideal for: Water quality, Environmental, Plating, Education Specifications Range 0 to 200 ppb Resolution 1 ppb Accuracy @ 25°C/77°F ±10 ppb ±4% of reading Light Source LED @ 525 nm Light Detector silicon photocell Method adaptation of the EPA Diazotization method 354.1 Environment 0 to 50°C (32 to 122°F); RH max 95% non-condensing Battery Type (1) 1.5V AAA Auto-off after ten minutes of non-use Dimensions 81.5mm x 61mm x 37.5mm (3.2" x 2.4" x 1.5”) Weight 64 g (2.25 oz.) Ordering Information HI764 Checker® is supplied with (2) sample cuvettes with caps, nitrite ULR reagent starter kit for 6 tests (6 powder reagent packets), battery, instructions and quick start guide. Warranty 6 month limited warranty

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Product Description The HI781-25 are high-quality reagents that are pre-measured, allowing for users to achieve fast and accurate measurements with their HI781 Marine Nitrate Low Range Colorimeter. These reagents follow a colorimetric method in which 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. Get your replacement reagents for your HI781 Marine Nitrate Low Range Colorimeter today. These high-quality reagents are manufactured in our state-of-the-art facility and are clearly marked with the lot number and expiration date on each packet for traceability. Pre-made reagents for ease of use. Prepared with high purity chemicals. Marked with expiration date and lot number for traceability What's Included: 1x PC x100 mL HI781A-0 25x PCS x 0.16g HI781B-0 25x PCS x 0.6g HI781C-0 25x PCS x Paper Filters

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Product Description Get accurate water testing results with the HI781 Marine Nitrate Low Range Colorimeter. With a digital read out, there is no more struggling to determine colors visually. This nitrate tester's compact design fits in your pocket or stores easily in your shop. Easier to use and more accurate than chemical test kits. One-button operation makes getting your nitrate results simple. Great for aquariums and marine environmental testing. Range 0-5 ppm on the meter Range 0-50 ppm (calculated) using a dilution method. Resolution 0.01 ppm The HI781 Checker®HC (Handheld Colorimeter) is a simple, accurate and cost-effective way to measure nitrate in saltwater. Nitrate is a bi-product of ammonia. It comes from fish waste, plant decay, and leftover food. Over time, nitrate can build up in your aquarium. While low levels are not harmful, too much nitrate can be detrimental to the health of your fish and plants. Both odorless and colorless, nitrate can only be detected by testing.  Designed as a more accurate alternative to chemical test kits, the HI781 marine nitrate meter provides quick, accurate results in a few easy steps. Features at-a-glance: For use with saltwater samples Easier to use and more accurate than chemical test kits Dedicated to a single parameter Small size, big convenience Ideal for aquariums and marine biology applications.

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Product Description The HI702 Checker®HC (Handheld Colorimeter) is a simple, accurate, and cost effective way to measure copper in your saltwater aquarium. Designed as a more accurate alternative to chemical test kits, the HI702 provides quick, accurate results in a few easy steps.  Don’t worry about the subjectivity of color charts, trust our handheld colorimeter for accurate measurements for your water testing. Get better accuracy than a standard test kit with our high range copper colorimeter . Our handheld colorimeter eliminates the effort of matching to a color chart by delivering a direct copper result digitally. Features at-a-glance: Easier to use and more accurate than chemical test kits Dedicated to a single parameter Small size, big convenience Ideal for: Saltwater Aquariums, Water quality, Environmental, Plating, Education Specifications Range 0.00 - 5.00 ppm Resolution 0.01 ppm Accuracy @ 25°C/77°F ±0.05 ppm ±5% of reading Light Source LED @ 575 nm Light Detector silicon photocell Method adaptation of the EPA method. The reaction between copper and the bicinchoninate reagent causes a purple tint in the sample Environment 0 to 50°C (32 to 122°F); RH max 95% non-condensing Battery Type (1) 1.5V AAA Auto-off after ten minutes of non-use Dimensions 81.5mm x 61mm x 37.5mm (3.2" x 2.4" x 1.5”) Weight 64 g (2.25 oz.) Ordering Information HI702 Checker®HC is supplied with 2 cuvettes and caps, reagent starter kit (6 packets of reagent), 1 X 1.5X AAA battery, and an instruction manual. Warranty 1 year limited warranty

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Product Description The HI702-25 are the replacement reagents for the HI702 Copper High-Range Checker®HC. These high-quality reagents are manufactured in our state-of-the-art facility and are clearly marked with the lot number and expiration date on each packet for traceability. Pre-made reagents for ease of use Prepared with high-purity chemicals Marked with expiration date and lot number for traceability The HI702-25 are high-quality reagents that are pre-measured, allowing users to achieve fast and accurate measurements with their Copper High-Range Checker® HC. These reagents follow the Bicinchoninate Method in which the reaction between copper and the reagent causes a purple tint in the sample. By simply adding the packet of HI702-25 reagent to the sample, the reaction will take place and the HI702 will determine the concentration from the color that is produced. The results will be displayed in ppm of copper. These reagents are designed to be used with samples that have an expected range of 0.00 to 5.00 ppm copper.

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Product Description Extreme Accuracy. Easy to Test in 4 Steps - Zero the Checker, Add a regent to your water sample, Insert the Vile in the Checker, Read the Numbered Results. BOOM EASY. ZAIR. Zero, Add, Insert, Read. Includes reagents for 25x tests. The HI758 Checker® HC (Handheld Colorimeter) provides a simple, accurate and cost effective way to measure calcium. Required for the development of calcium carbonate skeletons of coral reefs, calcium is a crucial component of marine waters. Designed as a more accurate alternative to chemical test kits, the HI758 provides quick, accurate results in four easy steps: Zero the Checker, Add a regent to your water sample, Insert the Vile in the Checker, Read the Numbered Results.  BOOM EASY. ZAIR.  Zero, Add, Insert, Read. *To zero 1 ml of reagent A is added to deionized/distilled water as a blank.

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Product Description Extreme Accuracy. Easy to Test in 4 Steps - Zero the Checker, Add a regent to your water sample, Insert the Vile in the Checker, Read the Numbered Results. BOOM EASY. ZAIR. Zero, Add, Insert, Read. Includes reagents for 25x tests. The HI758 Checker® HC (Handheld Colorimeter) provides a simple, accurate and cost effective way to measure calcium. Required for the development of calcium carbonate skeletons of coral reefs, calcium is a crucial component of marine waters. Designed as a more accurate alternative to chemical test kits, the HI758 provides quick, accurate results in four easy steps: Zero the Checker, Add a regent to your water sample, Insert the Vile in the Checker, Read the Numbered Results.  BOOM EASY. ZAIR.  Zero, Add, Insert, Read. *To zero 1 ml of reagent A is added to deionized/distilled water as a blank. Features at-a-glance: Easier to use and more accurate than chemical test kits Dedicated to a single parameter Small size, big convenience Ideal for: Aquaculture, Water Quality, Environmental, Education Includes: HI758 Calcium Checker is supplied with (2) sample cuvettes with caps, calcium reagent starter kit for 25 tests, dropper, (2) 1 ml syringes with tips, battery, instructions and quick start guide. Calcium Checker Troubleshooting Tips Never rinse your cuvettes with tap water or saltwater Use pure vapor distilled water from your local pharmacy at C1 phase. RODI water from home filtration units may not be suitable for this test as calcium can easily permeate through your filter membranes. Even though your TDS meter may read "zero" that number is subjective as you have to factor in the accuracy statement of the meter itself and if your storage reservoir has been contaminated. Clean your cuvettes with distilled or deionized water absent of Calcium that is going to be used for C1 phase dilution. Measure out 9 ml of distilled or deionized water for C1 phase Make sure no excess aquarium sample saltwater is on the tip of the pipette. Only administer the saltwater that is sucked into the pipette tip.

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Product Description Expired on Dec 2026  This reagent works with both the 755 & 772 Hanna checker.  It may come with the tag 755-26 or 772-26, both reagents work with both checkers. Extreme Accuracy. Easy to Test in 4 Steps - Zero the Checker, Add a regent to your water sample, Insert the Vile in the Checker, Read the Numbered Results. BOOM EASY. ZAIR. Zero, Add, Insert, Read. Includes reagents for 25x tests. The Hanna Marine Alkalinity Checker® bridges the gap between simple chemical test kits and professional instrumentation. Chemical test kits have limited accuracy and resolution since they rely upon the human eye to discern differences in color. Professional instrumentation incorporates a light source such as an LED or tungsten lamp with a filter and a light sensing detector to precisely determine absorbance and ion concentration. Professional instrumentation offers greater resolution and accuracy but can cost hundreds of dollars. The Hanna Marine Alkalinity Checker® uses a fixed wavelength LED and silicon photo detector to provide the accuracy of professional instrumentation at the affordable price of a chemical test kit. *To zero 1 ml of reagent A is added to deionized/distilled water as a blank.

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