Reliable measurement of water disinfection: This device measures the oxidation reduction potential (ORP), a reliable indicator of bacteriological water quality. It helps assess the effectiveness of water disinfection by measuring the strength of the ORP.Versatile and practical: Suitable for a variety of applications, from household to laboratory and industrial applications. It can be used for drinking water testing, aquariums, wastewater treatment, swimming pools, aquaculture, spas and much more.Convenient and compact design: With its compact pen size and light weight, it offers portability and ease of use. It is IP65 waterproof and has a HOLD function, automatic shutdown after 10 minutes of idle time and a low battery indicator.Automatic calibration and temperature selection: The device has an automatic calibration function for accurate readings. You can also select the temperature unit (C/F) to increase comfort.Specifications: The measurement range is -12001200mV with an accuracy of 2mV for ORP and 0.5C for temperature (@25C/77F). It operates in an environment of 060C (32~140F) with relative humidity below 90%. The device is powered by 3 x 1.5 V LR44 button cell batteries and weighs approx. 80 g with dimensions of approx. 187 x 37 x 37 mm.