Note:
The PH Pen Probe is a glassware, fragile product.Do not collision with objects.Once damaged, it cannot be replaced.Probe should be protected.After use, use the absorbent paper to gently absorb moisture on the probe.
Note:
PH Meter is calibrated before shipping, buyers do not need to re-calibrate after receiving the item!
You need to re-calibrate the PH meter in the following cases:
1. If you use it for a long time after calibration.
2. When using special electrodes.
3.If the requirements of measurement accuracy is relatively high.