Feature:1. Shell made of ABS material with lightweight handheld design, easy to carry anywhere2. High definition LED screen support automatic color change, make the result clearer3. Double stainless steel clips for more stable connection, very stable and reliable4. The pH measurement accuracy for 0.01pH, and the TDS reading accuracy is controlled at 2%, which is very accurate and practical5. Used in aquariums, water purifiers, home drinking water, swimming pools, agriculture, aquacultureSpecification:Item Type: PH TDS Meter ComboProduct Material: ABS, stainless steelpH Meter: Test Range: 0.00-14.00pHAccuracy: 0.01pHError: 0.1pHTDS Meter: TDS Measurement Range: 0-9999ppmTemperature Measurement Range: 0.1-80.0Conductivity Measurement Range: 0-9999 s/cmError: 2% (0-2000ppm), 5% (above 2000ppm)Use Scenarios: Aquariums, water purifiers, home drinking water, swimming pools, agriculture, aquacultureEach test pen uses 2 x LR44 button batteries, a total of 4 x LR44 button batteries are used(not include).Package List:2 x Test Pen(pH pen + TDS pen)3 x Reagent Powder2 x User Manual1 x Storage Box