Features:  High Quality Material: 4 in 1 digital water tester, press-button operated, has solid durable plastic shell, protective cap, sensitive titanium alloy probe & glass electrode.  Fast, Accurate Measurements: it enables pH / TDS / EC / temperature measurement (℃/℉ switchable), convenient calibration, automatic temp compensation for precise measuring.  Advantages: LCD screen clearly displays measurements; hold function locks data value on display, easy to read, record; auto shut-down after 5 mins non-operation, saves energy.  Mini Size: small, lightweight TDS meter, pen type designed, equipped with a lanyard hole on top, can be easily put it in the pocket or bag, taken to anywhere, used anytime.  Wide Range Of Application: this tester is a good helper to test pH balance, check purity of water, suitable for use in home drinking water, swimming pool, aquarium, spa, hydroponics, etc.    Specifications:  Material: ABS  Main color: white  PH range: 0.00~14.00pH (0.01pH resolution, ±0.05pH)  EC range: 1~19999μs/cm (1μs/cm resolution, ±2%)  TDS range: 1~19999ppm (1ppm resolution, ±2%)  Temp range: 0~60.0℃/32.0~140.0℉ (±0.5℃ accuracy)  Calibration: pH--6.86 point, accuracy ±0.1pH; 6.86/4.00(6.86/9.18)points, accuracy ±0.05pH; 6.86/4.00/9.18 points, accuracy ±0.02pH  EC--calibrated by factory (1413μs/cm)  TDS--calibrated by factory (1413μs/cm)  Temp compensation: automatic temperature compensation (0~60℃)  Power supply: 3 * 1.5V button cell (NOT included)  5 mins auto power-off: yes  Low power protection system: yes  Battery indicator: 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, others in pictures are not included.  Due to manual measurement, there may be deviation.  Due to lights or others, it may slightly differ from pictures.    Packing List:   1 * Digital Water Tester  3 * PH Calibration Powder  1 * User Manual