Feature 1The test pen can measure four parameters: total dissolved solids (TDS), electrical conductivity (EC), PH, and temperature. 2The test pen has high performance, fast measurement, high accuracy and high stability. 3The water quality test pen adopts ergonomic design, which is light and portable, and easy to use. 4Multifunction detection mode, simple and convenient function switching and a large LCD screen for easy and clear reading. 5The water quality tester is suitable for water sources, aquarium, hydroponics, hot springs, swimming pools and other water systems.Item Type: WaterQualityTestPenMaterial: PlasticWeight: Approx. 155g / 5.5oz Battery Attributes: 3 x 1.5V Button Battery LR44 (Battery Not Included)Technical Index:Range:PH: 0.00-14.00 PHEC: 0-19990us/cm 0-19.9ms/cmTDS:0-19990ppm0-19.9pptTemperature: 0C-50C (32F-122F)Resolution:pH: 0.01PHEC:1us / cm (<1999us / cm)10us / cm (> 1999us / cm)0.1 ms/cmTDS:1 ppm (<1999 ppm)10ppm (> 1999ppm)0.1pptTemperature 0.1C (0.2F)Accuracy:PH: 0.03 pHEC, TDS: 2%F.STemperature: 1Temperature Compensation: 0C-50CWorking Temperature: 0C-50CApplicable 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 xWaterQualityTestPen (Battery Not Included)1 x Manual1 x Screwdriver1 x Protective Shell