1、It can be used to measure the pH, TDS of the solution. 2、The electrode probe can be replaced, with an ATC function. 3、Easy to calibrate pH and TDS with a small screwdriver. 4、Temperature measuring range between -50℃~70℃, able to withstand harsh conditions, offering longer durable services. 5、Large and clear LCD with backlight, easy to read and accurately measuring functions. Feature: It can be used to measure the pH, TDS of the solution. The electrode probe can be replaced, with an ATC function. Easy to calibrate pH and TDS with a small screwdriver. Temperature measuring range between -50℃~70℃, able to withstand harsh conditions, offering longer durable services. Large and clear LCD with backlight, easy to read and accurately measuring functions. Suitable for water sources, aquarium, hydroponics, laboratory and scientific testing, spas, swimming pools and other water systems. Speciation: Battery: 4 x button battery (Not included) Size: Approx. 190 x 37 mm / 7.48 x 1.46 inch Package included: 1 x PH/TDS Meter 1 x Screw Driver 1 x Manual Note:The product is shipped without powder.