KL-035 is a waterproof pocket PH tester with a waterproof rating of IP55 All readings are automatically compensated for temperature (ATC), and the temperature values can be displayed in degrees Celsius℃ or degrees Fahrenheit℉. The electrodes can be replaced, the same mainframes may be reused, and cost savings may result from matching calibration fluids (liquid solutions or powders) and various packagings, as required by the client. Applications are sought in aquariums, aquaculture, soilless cultivation, swimming pools and hot springs; school laboratories; chemicals; food or drink manufacturing; textile dyeing; paper or pulp bleaching, printing, cooling towers and boilers; cleaning; or sewage treatment.