Vipe Electric Mini Digital Ph Meter Tester Hydroponics Pen Aquarium Pool Water Test

Specification: Resolution: 0.1pH Accuracy: ±0.1 pH (20°C), ±0.2 pH Operating Temperature: 0 - 50°C (32 - 122°F) Calibration: manual, 1 point Item Net Weight: approx. 57g (after installed batteries) Dimensions: 152 x 29 x 20mm (5.984 x 1.142 x 0.591 inch) Package Included: 1 x Digital pH meter 1 x Calibration Adjustment screwdriver 1 x User instruction (English) Note: Calibration buffer for pH Value Adjustment only, use only when you want to obtain specific pH; pH 4.00 (to obtain certain acidity, namely lower pH) pH 6.86 (to obtain neutual condition)