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PH-89P Waterproof High-Precision Flat pH Tester PH-89/89P/89L Waterproof High-Precision Flat pH Tester Newly upgraded flat electrode with dual-bridge structure for fast and stable measurements Diamond plastic casing, resistant to breakage, acids, and alkalis Powered by two AAA batteries, featuring ultra-long standby time and durability Suitable for pH measurement in dough, skin, cosmetics, fruits, milk, gastric juice, fruit juice, cheese, milk tea, meat, etc. Technical Specifications: Model PH-89/89P/89L Measurement Range pH 0.00–14.00 pH Temp 0–50°C Resolution pH 0.01 pH Temp 0.1°C Accuracy pH ±0.02 pH Temp ±1°C Automatic Temperature Compensation 0°C–50°C Battery 2×1.5V (AAA Batteries) Operating Temperature 0°C–50°C Calibration Method Automatic 2-point calibration Dimensions 210×40×25 mm Weight 97g