Specification:
Measuring range: -1999~1999mV
Resolution: 1mV
Temperature range: 0-50 ° C
Accuracy: ±5V
Battery: 4x1.5V AG-13 (not included)
Product size: 168x33x20MM

ORP negative potential pen uses common sense:
1. About the boot digital display problem
The value of the ORP negative potential pen value in the air is jumped, it does not change regularly, it is a normal phenomenon, the ORP pen does not carry any calibration liquid, the factory has been set up, can be used directly, non-professionals, do not yourself Correction.
2. About the water reading reading problem
ORP negative potential pen test needs to gently stir (in order to remove the bubbles on the glass probe) until the display value is stable (usually a few minutes or even 10 minutes or so), the value is very slow or jumped up and read the display value is measured value.
Negative potential is a relative concept. For example, the function of the water machine can reduce the potential of 300MV. When the tap water is 200MV, the filtered water reading is negative 100MV. If the tap water is positive 350MV, the filtered water is positive 50MV.
In addition, the negative potential is affected by various factors such as local water quality, water temperature, and the function of the filter element. The results of the test will be different and are normal.