Feature 1The 3 in 1 test pen is multifunctional, which can be used to measure PH, TDS, TEMP values. 2The electrode probe can be replaced and has an automatic temperature compensation function. 3The operation method is simple, only a mini screwdriver can easily calibrate pH and TDS. 4Large and clear LCD with backlight ensures that you can read the value easily and it has accurate measurement function. 5Suitable for water sources, aquarium, hydroponics, hot springs, swimming pools and other water systems.Item Type: Water Quality TesterMaterial: PlasticWeight: Approx. 161g / 5.7oz Range:PH Value: 0.00-14.00PHTDS: 0.00-19990ppmTemperature: -50 -70 (-58 -158)Resolution:pH value: 0.01PHTDS: 10ppmTemperature: 0.1(0.2)Accuracy:pH value: 0.1PHTDS: 2%FSTemperature: 1 (2)Temperature Compensation: 0C-50C (32F-122F)Working Temperature: 0C-50C (32F-122F)Battery: 4 x 1.5V AG-13 Button Battery (Battery Not Included)Applicable Scenarios: suitable for water sources, aquariums, hydroponics, hot springs, swimming pools and other water systems.How to Use:After installing the battery, open the cover and put the measuring head into the liquid to be measured, and the value can be displayed in a moment. .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 Tester(Battery Not Included)1 x Manual1 x Screwdriver1 x Protective Shell