Features： 1、Multi Purpose: Digital dissolved oxygen meter is suitable for water source detection, aquaculture, sewage treatment, farmland irrigation, laboratory, farm and other places. 2、Data Storage: The data of dissolved oxygen meter can be automatically saved and manually saved, the saved data can be exported to an Excel table, and can also be shared with your friends. 3、Data Synchronization: Water quality analyzer independent mobile APP, data synchronization, comprehensive functions, worry free and energy saving, easy to operate. 4、Highly Sensitive Probe: Smart dissolved oxygen meter uses a highly sensitive probe, accurate measurement data, and detachable. 5、Easy to Replace: Dissolved oxygen meter kit probes are easy to replace and come with 6 probe covers for great protection. Specification： Item Type: Digital Dissolved Oxygen Meter Material: ABS Battery: 3 x LR44 Button Batteries (not Included) Dissolution Measurement Range: 0.0 to 30.0mg/L Dissolved Oxygen Saturation: 0.0 to 300.0% Temperature: 0.1 to 40.0 DegreeC;32.0 to 104.0 DegreeF Dissolved Oxygen Saturation: 0.1% Dissolved Oxygen Saturation: Within Less Than 1.5%F.S Standard 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 DegreeC) Automatic Temperature Compensation Range: 0.1 to 50 DegreeC Low Battery Warning: Support Auto Backlight: Support Power: Automatic Shutdown for About 8 Minutes Operating Environment: 0.1 to 50.0 DegreeC RH Maximum 90% Weight: Approx. 370g / 13.1oz Package List： 1 x Digital Dissolved Oxygen Meter 1 x Electrode 6 x Electrode Tip 1 x Electrode Filler 1 x English User Manual