This digital pen style pH meter is an ideal instrument for aquarium、 fishing industry、 swimming pool、 school laboratory、 food & beverage etc.100% brand new meter with protective plastic case and calibration screwdriverExcellent meter、 very acurate and durableSpecification:Measuring pH Range: 0.0 - 14.0 pHResolution: 0.1 pHAccuracy: ＼0.1 pH (20＜C)、 ＼0.2 pHOperating Temperature: 0 - 50＜C (32 - 122＜F)Calibration: manual、1 pointItem 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 meter1 x Calibration Adjustment screwdriver3 x Batteries Included in pH Meter1 x User instruction(English)