Features: Waterproof housing IP65 rating Automatic 3 points Calibration ( 4, 7, 10) Can measure alkaline solution Display Temperature & pH simultaneously Easy to switch between °C and °F Data Hold & ATC Auto Power off that can be disabled Pen size, easy to fit in pocket Low battery indicator High quality and accurate testing results are guaranteed Approved by strict quality and safety standards Wide range of application: Pools, Aquariums, Labs, Aquaculture, Car washes, Water testing, and Wastewater treatment Specifications: Measuring Range: 0~14pH Accuracy : ±0.2pH Resolution : 0.1pH Calibration Point: 4, 7, 10 Temperature Accuracy: ±1°C Temperature Resolution: 0.5°C/°F Automatic Temperature Compensation : 0~50°C Operating Condition Operating Temperature: 0°C~50°C (32°F~122°F) Operating Humidity: 0~80%RH Display: LARGE 4-digit display Storage Temperature: 0~50°C Dimension: 165 x 35 x 32mm (L x W x H) Set Includes: 1 x pH & Temperature Meter 4 x FREE 1.5V batteries 3 x pH Powder ( pH4.01, pH7.00 & pH10.01) English Instruction Manual