Feature: 1. Pen cover design, easy to carry, not easy to damage, no loss of sensitivity. 2. Portable water quality analyzer, home use, hospital natatorium, water plant laboratory, aquaculture. 3. High definition display screen, quick and simple accurate measurement, large digital display more clearly. 4. Manual one key automatic calibration mode, solve the problem that the long storage time of automatic calibration can not be accurately calibrated. 5. The top adopts nice sealing process to prevent energy consumption in wet environment. 6. PH pen is electrode probe, heat and cold resistant, high sensitivity. 7. TDS\u0026EC pen is titanium alloy probe, high hardness, anti-rust and oxidation resistance. Specification: Portable water quality analyzer, high definition display screen, manual one key automatic calibration mode, the top adopts nice sealing process to prevent energy consumption in wet environment, accurate measurement, simple and quick. Features: Pen cover design, easy to carry, not easy to damage, no loss of sensitivity. Portable water quality analyzer, home use, hospital natatorium, water plant laboratory, aquaculture. High definition display screen, quick and simple accurate measurement, large digital display more clearly. Manual one key automatic calibration mode, solve the problem that the long storage time of automatic calibration can not be accurately calibrated. The top adopts nice sealing process to prevent energy consumption in wet environment. PH pen is electrode probe, heat and cold resistant, high sensitivity. TDS&EC pen is titanium alloy probe, high hardness, anti-rust and oxidation resistance. Specifications: Type: Single Yellow PH Pen White TDS Pen & Yellow PH Pen White TDS Pen & PH Pen Blue TDS Pen & Yellow PH Pen Blue TDS Pen & White PH Pen (optional) Measuring Project: PH, TDS&EC TDS Measure Range: 0-9990ppm TDS Tempreture Measure Range: 0.1-80℃ / 32-176℉ TDS Error: ±2% TDS Cell: 1 * CR2032 Button Cell, 3V 240mAh (included) TDS Probe: Titanium Alloy PH Measure Range: 0-14 PH Accuracy: 0.01 PH Error: ±0.05 PH Cell: 2 * LR44 Button Cell, 3V 240mAh (included) PH Probe: Electrode Package Weigth: 106g / 3.74ounces 190g / 6.70ounces Package Size: 150 * 30 * 20mm / 5.91 * 1.18 * 0.79in 200 * 110 * 20mm / 7.87 * 4.33 * 0.79in Packing List: 1 * PH Test Pen 1 * TDS&EC Test Pen 6 * Corrective Powder 2 * Instruction Book Package List: 1 * PH Test Pen 1 * TDS&EC Test Pen 6 * Corrective Powder 2 * Instruction Book