Specification:Item Type: Digital Dissolved Oxygen MeterMaterial: ABSBattery: 3 x LR44 Button Batteries (not Included)Dissolution Measurement Range: 0.0 to 30.0mg/LDissolved Oxygen Saturation: 0.0 to 300.0%Temperature: 0.1 to 40.0°C;32.0 to 104.0°FDissolved Oxygen Saturation: 0.1%Dissolved Oxygen Saturation: Within Less Than 1.5%F.SStandard Method: Support Single Point or Double Point Automatic Calibration, That Is, 0 or Air Automatic 100% Calibration.Response Time: Less Than or Equal to 45s (90% Response at 20°C)Automatic Temperature Compensation Range: 0.1 to 50°CLow Battery Warning: SupportAuto Backlight: SupportPower: Automatic Shutdown for About 8 MinutesOperating Environment: 0.1 to 50.0°C RH Maximum 90%Weight: Approx. 370g / 13.1ozHow to Use:Download software. Turn on the switch, place the electrode in the test solution, and wait for the test to stabilize.Package List:1 x Digital Dissolved Oxygen Meter1 x Electrode6 x Electrode Tip1 x Electrode Filler1 x English User ManualNote:Shipped without battery, shipped with liquid.