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three-layer UV treated PEVA material for a balance of breathability and durability
this will be the best choice
low voltage DC 12V working voltage
Both Functional and sturdy
Ultra soft and smooth
pH Meter Tester Pen Solder three-layer UV treated PEVA materialDescription: Free Auxiliary Standard Calibration: long press CAL for 5 seconds to enter the calibration mode, and press to select the powder corresponding to 6. 86 and 4. 01to complete the calibration. Likewise, pH meters feature automatic temperature compensation that adjusts for water temperature and water quality, giving a pH reading almost instantly. Simple Operation: Easy to use and calibrate. Just press the "ON" button to get the PH test result
