Portable water quality analyzer with high-definition display screen and manual one-key automatic calibration mode. Features a sealed top design to prevent energy consumption in wet environments. Provides accurate, simple, and quick measurements. Features: Pen cover design for easy portability, durability, 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 after long storage periods. Sealed top construction helps prevent performance issues in humid or wet conditions. pH pen features an electrode probe with heat and cold resistance and high sensitivity. TDS & EC pen equipped with titanium alloy probe for high hardness, rust resistance, 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: 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: Electrode Package Weight: 106g / 3.74oz 190g / 6.70oz 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 × Calibration Powder Packets 2 × Instruction Manuals