QiWei PH-20 PH meter (pen)

Qiwei PH-20 pH meter is a pen acidity meter with an accurate measurement of ± 0.1pH, which can measure pH and temperature at the same time. The PH-20 pen acidity meter is a built-in electrode, which is suitable for monitoring tap water, aquaculture, environmental protection, agriculture, printing and dyeing and other fields.