?Feature: Convenient， efficient and accurate LCD digital display， easy to read Auto shut-off after 10 minutes' non-use Long battery life Provide a leather case Specification:Color: Blue Range: 0~9999 ppm(mg/L) Accuracy: ±2% Calibration: Facotry Calibrated Work temperature: 0~50℃ Battery: 2 * 1.5v button cell Item weight: 35g / 1.2oz Package weight: 55g / 1.9oz Package size: 15.5*3.5*2cm / 6.1*1.4*0.8in Package Includes: 1 * TDS Meter 1 * Leather Case 1 * User Manual