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 accuracy even after long storage periods. Top sealing process enhances performance in humid or wet conditions. pH pen equipped with electrode probe, resistant to heat and cold, offering high sensitivity. TDS & EC pen features titanium alloy probe with 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: 09990 ppm TDS Temperature Measurement Range: 0.180C / 32176F TDS Accuracy: 2% TDS Battery: 1 x CR2032 button cell, 3V 240mAh (included) TDS Probe: Titanium Alloy pH Measurement Range: 014 pH Resolution: 0.01 pH Accuracy: 0.05 pH Battery: 2 x LR44 button cells, 3V 240mAh (included) pH Probe: Electrode Package Weight: 106g / 3.74 oz 190g / 6.70 oz Package Size: 150 x 30 x 20mm / 5.91 x 1.18 x 0.79 in 200 x 110 x 20mm / 7.87 x 4.33 x 0.79 inPacking List: 1 x pH Test Pen 1 x TDS & EC Test Pen 6 x Calibration Powder Packets 2 x Instruction Manual