Features: High quality material: 4 in 1 digital water tester, push button operated, features a strong and durable plastic shell, a protective cap, a sensitive titanium alloy probe and a glass electrode. Quick and precise measurements: it allows the measurement of pH / TDS / EC / temperature ( switchable /), convenient calibration, automatic temperature compensation for precise measurement. Advantages: The LCD display clearly displays measurements; backlight ensures easy reading of data even in the dark; the hold function locks the value on the screen, ideal for recording; automatic shutdown saves power. Mini size: Small, lightweight TDS meter, pen type designed, equipped with a lanyard hole on the top, can be easily put in pocket or bag, taken anywhere, used anytime. Wide range of applications: This tester is a good helper for testing pH balance , check the purity of water, suitable for use in home drinking water, swimming pool, aquarium, spa, hydroponics, etc. Features:< br/> Material: ABS Main color: white pH range: 0.00 ~ 14.00 pH (resolution 0.01 pH, 0.05 pH) EC Range: 1~19999s/cm (resolution 1s/cm, 2%) TDS range: 1~19999ppm (resolution 1ppm, 2%) Temperature range: 0~60.0/32.0~140.0 (accuracy 0.5) Calibration: pH - 6.86 points, accuracy 0.1 pH; 6.86/4.00 (6.86/9.18) points, accuracy 0.05 pH; 6.86/4.00/9.18 counts, accuracy 0.02pH EC--factory calibrated (1413s/cm) TDS--factory calibrated (1413s/cm) cm) Temperature compensation: automatic temperature compensation (0 ~ 60) Power supply: 3 * 1.5V button battery (NOT included) 5 minutes automatic power off: yes Low consumption protection system: yes Battery indicator: yes Backlight: yes Item size: 183*37*37mm/7.20*1.45*1.45in Item Weight: 90g / 3.17oz Package Size: 23.5*8.5*5cm/9.25*3.34*1.96in Package Weight: 165g / 5.82oz Note:Digital Water Tester only, other pictures are not included.Due to manual measurement, there may be deviation. Due to lights or others, it may slightly different from the pictures. Packing list: 1 * Digital Water Tester 3 * pH Calibration Powder 1 * User Manual