Pool Line Alkalinity Checker HC – HI7754

The Hanna Alkalinity Checker® Handheld Colorimeter (HC) 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 at a specific wavelength and a light-sensing detector to precisely determine absorbance and ion concentration. The Pool Line Alkalinity Checker® HC 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.

  • Precise measurements with no guessing of color
  • Laboratory measurements at a fraction of the cost
  • Simple, intuitive operation



HI7754 Pool Line Checker® Handheld Colorimeter is designed for the measurement of alkalinity in swimming pools, hot tubs, and spas. Alkalinity is a very important parameter in monitoring swimming pool water chemistry. Alkalinity is the buffering capacity of a solution to resist a pH change from the addition of an acid or base. This can be a challenge when using common forms of chlorine, in that, as a base when the chlorine is added the pH will increase. As the pH of the water increased above pH 7.4 the chlorine becomes predominately in the hypochlorite form instead of the hypochlorous acid as the pH decreases from pH 7.4. Hypochlorous acid is 100 times more effective as a sanitizer than the hypochlorite form. When water is low in alkalinity the pH will increase as the chlorine is added. When there is adequate alkalinity then as the chlorine is added the base is absorbed and the pH remains the same. Monitoring alkalinity is important in maintaining a stable pH of a swimming pool hot tub, or spa.

The contoured style of these Checkers’ 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.

To perform a measurement the instrument a water sample is placed into a cuvette and the meter is zeroed. Next, a reagent is added that will react with alkalinity to produce a distinctive range of colors from yellow to greenish-blue. Last, place the vial into the Checker, press the button and read the results. It’s that easy. It is important to note that if chlorine is in the water sample to be tested then it is necessary to add HI937554-53 chlorine remover first before proceeding with the test.


  • The Checker®HC is simple to use
  • “Zero” the Checker®HC as required in specific procedure
  • Addreagent to your water sample
  • Place the vial into your CheckersHC
  • Press the button and read the result


SKU: HI7754

Product Name: Pool Line Alkalinity Checker HC – H17754

Quote Required: Yes

Alkalinity Range: 0 to 500 ppm (as CaCO3)

Alkalinity Resolution: 1 ppm

Alkalinity Accuracy: ±5 ppm ± 5% of reading

Alkalinity Method: colorimetric Method. The reaction causes a distinctive range of colors from yellow to greenish blue to develop. This checker has been developed to work with fresh water samples.

Photometer/Colorimeter Light Source: LED @ 610 nm

Photometer/Colorimeter Light Detector: silicon photocell

Battery Type/Life: 1.5V AAA

Automatic Shut-Off: after 10 minutes of non-use and 2 minutes after reading

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

Weight: 64 g (2.3 oz.)

Dimensions: 86.0 mm x 61.0 mm x 37.5mm (3.2 x 2.4 x 1.5″)

Ordering Information: HI7754 Checker HC is supplied with sample cuvettes with caps (2 pcs.), Alkalinity reagent starter (25 tests), 1.5VAAA battery (1 pc.), and instructions all packaged into a custom carrying case.

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