Range:
(A) the water hardness value: 1.50 × 10-2 ~ 1.00 × 102 mmol / L
Equivalent to other units: 1.50 ~ 1.00 × 104 mg / L (CaCO3)
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)

(B) the temperature value: 0 ~ 60.0  c
Note: temperature units are degrees and degrees f, you can set it by youself
Main characteristics of water hardness is the calcium and magnesium ions in water the total concentration, it is an important indicator of water quality. The instruments used by the test, the electrode of a large number of experimentally it capacity with EDTA titration method with the same accuracy and avoid EDTA titration method of many shortcomings, such as operation of trouble, end of uncertainty, and do not fit in the muddy waters and colors used in the water.
This instrument built-in microprocessor chip, international GLP functionality, appearance, easy to use and has the following features:

Using 601-F-type water hardness combined electrode, which consists of electrodes, Ag/AgCl reference electrode and a combination of temperature electrode, electrodes of PVC film to a new neutral carrier for the active substances, calcium and magnesium ions in the same amount of selective, has a novel structure, potential stable, fast response, easy-to-use features.
 Electronic unit uses intelligent chip design, with automatic calibration, automatic temperature compensation, data storage, RS232 output, measured with an auto-locking and other intelligence function.
 Can choose five water hardness units: mmol/L, mg/L (CaCO3), mg/L (CaO), mmol/L (Boiler) and mg/L (Ca), the other three units º f H (France), º d H (Germany) and º e H (United Kingdom), you can select the WH-Link communication software.
 Equipped with B1, B2 and B3 three correction solution.
With blue backlit LCD screen.
 Configuration WH-Link communications software instrument test data upload to a PC.