Feature 1With Relay Output Power Socket: pH can be controlled as required. You can easily and quickly replace the fuse with external replacement. Removable and replaceable pH electrodes. 2With Power Plug: For use with gas stones, oxygen pumps, carbon dioxide regulators, solenoid valves and other pH control devices. 3Calibration: Feel free to test EC in us/cm and ms/cm units. pH EC can be easily calibrated with just a mini screwdriver and automatic temperature compensation. 4Clear LCD With Backlight: Easy to use and provides immediate display of results. Test temperature C F (switchable unit), long term online monitoring and control of pH value. 5Multipurpose: Used to test the pH, temperature, EC (conductivity) of water, suitable for swimming pools, aquariums, soilless cultivation, laboratory, environmental water.Item Type:PH MeterMaterial: ABSScope:PH: 0.00-14.00PHEC: 0-1999us/cm ms0-19.99ms/cmTemperature: -50-70 (-58-158)Resolution:PH: 0.01PHEC: 1us/cm ms0.01ms/cmTemperature: 0.1C (0.2F)Accuracy:PH: 0.1PHEC: 2%F.STemperature: 1.0C (2F)Alarm Setting Range: PH 3.50PH-10.50PHWeight: Approx.1013g / 35.7oz .wang-edit-text{ font-family:'Arial' !important; } .wang-edit-text table { border-top: 1px solid #000; border-left: 1px solid #000; } .wang-edit-text table td, .wang-edit-text table th { border-bottom: 1px solid #000; border-right: 1px solid #000; padding: 3px 5px; } .wang-edit-text table th { text-align: center; }Package List1 x Water Quality Tester1 x PH Electrode1 x Temperature Electrode2 x Suction Cup1 x Screwdriver1 xUser Manual4 x Screw4 x Expansion Plug