1 x 5 in 1 tds meter(LR44 battery include, replaceable), 3 x calibration powder. More precise accuracy design and larger testing range than others to your drinking water is healthy. 0.01 accuracy; 0-14PH, 0~200000ppm tds, 0-200000us/cm ec, 0.01%-25% 0-1000ppm salt measure range of the digital ph meter you get a accurate testing result. TDS meter is designed with 5-in-1 function, which can be measured PH, TDS, EC, SALITY, and TEMPERATURE of water. Fulfill all your testing requirements - fully test water quality Get Healthy Pure drinking water or other use water with this 5 in 1 tds meter. The tester has been calibrated at the factory before shipment, no need to re-calibrate, it is ready to use right out of . Just dip the probe of the PH tester into the liquid to start the test PH, TDS, EC, SALITY, and TEMPERATURE. Easy to carry & use. Everyone could use this pocket size small but professional tds tester device to measure your drinking water, pool, fish tank, garden water and etc. And pH meter features a green Backlight LCD to help you see the measurement clearly in any situation. No need to pay attention to the temperature of testing liquid, meter can accurately determine the PH, TDS, EC, SALITY value of the sample in the temperature range of 0 C-60 C (32F-140F), so as to solve the inaccurate problem caused by changing the liquid temperature. Material: metal + plastic Color as shown Package Contents: 1 x Water Quality Tester 3 x calibration pack Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.