Features Features: The PH TDS meter combo shell made of ABS material with lightweight handheld design, easy to carry anywhere. With protective sleeve; Lightweight handheld design for easy carrying. LED Screen: The PH TDS meter combo with high definition LED screen support automatic color change, make the result clearer. It can also be used at night. Stable and Reliable: Double stainless steel clips for more stable connection, very stable and reliable. The PH TDS meter combo has complete measuring range, reliable and fast reading. Practical: The pH measurement accuracy for 0.01pH, and the TDS reading accuracy is controlled at ± 2%, which is very accurate and practical. Each test pen uses 2 x LR44 button batteries and a total of 4 x LR44 button batteries (not included). Wide Application: The PH TDS meter combo use in aquariums, water purifiers, home drinking water, swimming pools, agriculture, aquaculture. Suitable for all home and laboratory TDS and pH testing applications. Specification: Item Type: PH TDS Meter ComboProduct Material: ABS, 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) Package List: 2 x Test Pen(pH pen + TDS pen) 3 x Reagent Powder 2 x User Manual 1 x Storage Box Package List 2 x Test Pen(pH pen + TDS pen) 3 x Reagent Powder 2 x User Manual 1 x Storage Box