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Calcium Hardness (Mg, Ca) Photometer w/555 nm LED

Product #DI-HI93720


Availability: In stock

Description: Hanna Digital Instruments Calcium Hardness Photometer 0.0-2.70 mg-l, two different meters to measure magnesium and calcium, results are expressed in CaCO³ equivalent
Brand: Hanna Digital Ins.


Product Information




Calcium Hardness Photometer 0.0-2.70 mg-l Hanna Digital Instrument 2 year warranty

Water, with exception to distilled water, contains dissolved salts (magnesium and calcium carbonates). The concentration of these salts determines the water hardness, which can be expressed in calcium carbonate or magnesium carbonate. The sum of these two represents the total hardness level.

The presence of dissolved salts is due to the fact that water often comes from underground sources which are in turn made up of rain water filtered through deep ground layers. Rain water eventually reaches a waterproof flooring and forms a natural tank which is also called the water bearing stratum.

By passing through the various layers of soil and rock, rain water dissolves some of the mineral substances. Hardness is a consequence of the type of rock layers which the water passes through and of its permanence in the water bearing stratum.

In addition, this parameter is also related to the phenomenon of pipe rusting in water heating and cooling systems, reverse osmosis and demineralization plants.

HANNA offers two different meters to measure magnesium and calcium, results are expressed in CaCO³ equivalent.

Range 0.00 to 2.70 mg/L

Resolution 0.01 mg/L

Accuracy ±0.11 mg/L ±5% of reading

Light Source LED 555 nm

Light Life Life of the instrument

Light Detection Silicon Photocell

Battery Type / Life 1 x 9V / approx. 40 hours of continuous use;

auto-off after 10 minutes of non use

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

Dimensions 180 x 83 x 46 mm (7.1 x 3.3 x 1.8")

Weight 290 g (10 oz.)

Method Adaptation of the Standard Methods for the Examination of Water and Wastewater, 18th ed.; Calmagite method. The reation between Ca and reagents causes a red tint in the sample

HANNA instruments, a world leading manufacturer of analytical instrumentation, has a network of 40 subsidiaries in 32 countries worldwide and offers over 3000 products to its customers. HANNA is headquartered in Woonsocket, RI.


  • Weight: 6 lb
  • Height: 14 in
  • Width: 6 in
  • Depth: 4 in
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DI-HI93720

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