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Water hardness refers to the water in the total concentration of calcium and magnesium ions, it is an important indicator of water quality. This instrument uses a unique electrode testing, the large number of experiments show that the capacity titration with EDTA has the same accuracy, and avoid the many shortcomings of EDTA titration, such as operational problems, the end to determine the uncertainty, and is not suitable for turbidity and color of the water used.
● the use of intelligent electronics chip design, with automatic calibration, automatic temperature compensation, data storage, the measurement value is automatically locked, low-voltage automatic shutdown and other intelligent display features.
● can choose eight kinds of water hardness units: mmol / L, mg / L (CaCO3), mg / L (CaO), mmol / L (Boiler), mg / L (Ca), º fH (French degrees), º dH (German degrees) and º eH (UK degrees).
● Host ST-300 is equipped with its own B1, B2 and B3 three kinds of calibration solutions.
● blue backlight LCD with digital display.
● Host ST-300 has a reliable waterproof design (waterproof grade IP67).

Technical parameters
1. Measuring range:
(A) Water hardness: 1.50 ~ 1.00 × 104 mg / L (CaCO3)
Equivalent to other units: 1.50 × 10-2 ~ 1.00 × 102 mmol / L
8.41 × 10-1 ~ 5.61 × 103 mg / L (CaO)
3.00 × 10-2 ~ 2.00 × 102 mmol / L (Boiler)
6.02 × 10-1 ~ 4.01 × 103 mg / L (Ca)
1.50 × 10-1 ~ 1.00 × 103 º fH (French degrees)
8.40 × 10-2 ~ 5.6 × 102 º dH (German degrees)
1.05 × 10-1 ~ 7.00 × 102 º eH (UK degrees)
(b) temperature: 0 --- 60.0 ℃
Note: The temperature unit is ℃ and ℉, can set your own.


(2) Resolution:
(a) Water hardness: 0.01 and 0.1 units of water hardness
(b) temperature: 0.1 ℃

3 Accuracy:
(a) Water hardness: ≤ ± 5% FS
(b) Temperature: ≤ ± 0.5 ℃
4 automatic temperature compensation range: 5 --- 50 ℃
5 Brand: SINTEK
6 configuration, including: the host ST-300 hardness tester (1no); portable hardness probe (1no); calibration solution (3no); correction Cup (1no);
Operation Manual (1no); certificate (1no)