Portable water quality analyzer with high-definition display screen, manual one-key automatic calibration mode, and advanced sealing process on top to prevent energy consumption in wet environments. Offers accurate measurement with simple and quick operation. Features: Pen cover design for easy carrying, protection against damage, and maintained sensitivity. Suitable for home use, hospitals, swimming pools, water treatment plants, laboratories, and aquaculture. High-definition display with large digital readout for clear and fast measurement. Manual one-key automatic calibration mode ensures accurate calibration even after long storage periods. Top-sealed construction enhances durability and prevents moisture-related issues in humid conditions. PH pen features an electrode probe with resistance to heat and cold, delivering high sensitivity. TDS & EC pen equipped with titanium alloy probe for 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) Measurement Parameters: PH, TDS, EC TDS Measurement Range: 0–9990 ppm TDS Temperature Measurement Range: 0.1–80°C / 32–176°F TDS Accuracy: ±2% TDS Battery: 1 × CR2032 button cell, 3V 240mAh (included) TDS Probe Material: Titanium Alloy PH Measurement Range: 0–14 PH Resolution: 0.01 PH Accuracy: ±0.05 PH Battery: 2 × LR44 button cells, 3V 240mAh (included) PH Probe Type: Electrode Package Weight: 106g / 3.74 oz 190g / 6.70 oz Package Dimensions: 150 × 30 × 20mm / 5.91 × 1.18 × 0.79 in 200 × 110 × 20mm / 7.87 × 4.33 × 0.79 in Packing List: 1 × PH Test Pen 1 × TDS & EC Test Pen 6 × Calibration Powder Packets 2 × Instruction Manuals