With Backlight Or Not : YESIs Smart Device : NOModel Number : PH-618Certification : CEDisplay Type : DIGITALPH Tester : pH MeterHigh Precision PH Temp Meter Automatic Correction Waterproof Water Quality analyzer Acidity Meter Pen Type Aquarium pool SPA 40%OFFOption 1:Feature:1.For measuring the solution PH value and temperature.2.Waterproof grade IP65, can replace the sensor probe.3.Automatic correction function.4.Suitable for water, aquariums, hydroponics, spa, swimming pools and other water systems.5.A variety of applications, for testing virtually any acidic liquid and basic levels.6.Compact and lightweight pen design.7.Automatic shut-down.8.Easy to use and provides instant results displayed.Specifications:Range: 0.00 ~ 14.00pHTemperature:0C ~ 50C (32F ~ 122F)Resolution: 0.01pH;Temperature:0.1C (0.2F)Accuracy: 0.1pH ;Temperature:1.0COperating Temperature: 0C ~ 50C (32F ~ 122F)Temperature Compensation: 0C ~ 50C (32F ~ 122F)Battery: 31.5V (AG-13) Button Cell Battery (not included)Color: YellowMaterial: ABSWith backlightItem Size: 18.8 * 3.5 * 3.5cm / 7.4 * 1.4 * 1.4inItem Weight: 98gPackage List:1 * pH Meter1 * User Manual1 * boxOption 2:Specifications:1.Measuring range: PH: 0.00-14.00 PH Temp: 0.1C-60C2.Resolution: PH: 0.01PH Temp: 0.1C3.Precision: PH: +/- 0.01 PH Temp: +/-0.5C4.Automatic temperature compensation: 0-80C5.Battery: 3 *1.5 V(AG-13)(not inculde)6.Operation temperature: 0-80C7.Calibration: Automatic two point calibration8.Auto shut off function: 4 minutes9.Size : 183mm*37mm*37mm10.Without backlight