Feature: 1. Shell adopt ABS material with lightweight handheld design, easy to carry anywhere 2. High definition LED screen with automatic color change, make the result clearer 3. Double stainless steel clips bring more stable connection, very stable and reliable 4. The pH measurement accuracy for 0.01pH, and the TDS reading accuracy is controlled at ± 2%, which is very accurate 5. Suitable for aquariums, water purifiers, home drinking water, swimming pools, agriculture, aquaculture Specification: Item Type: PH TDS Meter Combo Product Material: ABS Clips Material: Stainless steel pH Meter: Test Range: 0.00-14.00pH Accuracy: 0.01pH Error: ±0.1pH TDS Meter: TDS Measurement Range: 0-9999ppm Temperature Measurement Range: 0.1-80.0℃ Conductivity Measurement Range: 0-9999 μs/cm Error: ± 2% (0-2000ppm), ±5% (above 2000ppm) Use Scenarios: Aquariums, water purifiers, home drinking water, swimming pools, agriculture, aquaculture Each 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