Combo Series waterproof pocket instruments offer high precision in pH, EC / TDS and temperature measurements. It is no longer necessary to use 2 or 3 instruments for this type of measurement. In fact, these testers display on the screen, the pH or EC / TDS readings automatically compensated in temperature and the value of the sample temperature in ° C.The COMBO HI98130 Waterproof pH / EC / TDS / Temp (EC High Range) Tester is waterproof and buoyant. In addition, it includes a large screen with two levels of reading and automatic disconnection in case of inactivity. The pH electrode can be replaced very easily and has a long life thanks to the renewable fiber junction. The graphite CE / TDS probe does not suffer any damage caused by salts and other aggressive substances. The Combo series is the fastest, most efficient and accurate solution for all pH / EC / TDS / Temperature controls, on samples. These new combination pocket gauges are designed to achieve precious measurements. They have an error prevention system in their batteries as well as auto-shutdown and have an indicator of stability, calibration and automatic temperature compensation. In summary, the main features are: - Easy to use, using only two buttons - Water resistant - The pH electrode, in addition to being easy to replace, is equipped with a renewable fiber junction that allows to extend its useful life - The stainless steel connector. of the replaceable pH electrode, it is robust and inserts without difficulty. - The graphite CE / TDS probe ensures more accurate measurements, as it does not tend to form deposits with the salts present in the sample solution.- Fully exposed stainless steel temperature sensor reduces instrument response times. Automatic temperature compensation. - Automatic 1 or 2 point pH calibration - Automatic shutdown.