Features: Suitable for water sources, hydroponics, spas, swimming pools, and other water systems. 3-in-1 multifunctional water tester that measures pH, TDS, and temperature of liquids. Large LCD display for easy reading of values. Highly efficient and accurate with advanced microprocessor technology. Lightweight and portable design for convenient indoor and outdoor use. Automatic temperature compensation from 0°C to 60°C. Specifications: Material: ABS Battery: 3 x 1.5V AG-13 button batteries (not included) Temperature compensation: Automatic (0–60°C) Auto power off: 5 minutes Operating temperature: 0–60°C (32–140°F) Humidity: 100% RH Size: 183 x 37 mm (7.2 x 1.5 inches) Measurement Range: pH: 0.00–14.00 TDS: 1–19999 ppm Temperature: 0–60°C Resolution: pH: 0.01 TDS: 1 ppm Temperature: 0.1°C Accuracy: pH: ±0.05 TDS: ±2% Temperature: ±0.5°C Calibration: pH calibration at 6.86 point: accuracy ±0.05 pH Dual-point calibration at 6.86 and 4.00 (or 9.18): accuracy ±0.02 pH Factory calibrated (1413 ppm solution) Package List: 1 x Water Tester (batteries not included) Note: The new or old version of this product may be shipped randomly. Please ensure you are comfortable with this before ordering.