The measurement range has 0 -1999 S /2.00 ~19.99 mS conductivity measurement range, 0~1999 ppm/0~19.99 ppt TDS measurement range, 3%FS +/-1 digit conductivity/TDS measurement error, 1s/0.01mS instrument Repeatability. Temperature unit C/F (switchable) to meet the needs of use in various environments. The high-precision advanced 3-in-1 smart pen combines conductivity, TDS and temperature measurement for high accuracy, equipped with a high-quality titanium alloy probe, and reliable automatic temperature compensation (ATC) ensures readings are always accurate at a variety of temperatures. The hand-held design of the replaceable probe and the non-slip handle make it easy to operate. It can be configured with a replaceable sensor probe - the electrode probe can be replaced with a plug-in design, making replacement quick and easy. Easy to use This COND/TDS meter is highly accurate and stable. It uses an LCD display with switchable backlight for easy use in the dark. The COND/TDS meter is made of high-quality materials and is compact, lightweight, portable, durable and practical. Wide Applications Salinometer is suitable for water sources, soilless, planting, aquariums, hydroponics, laboratories, spas, environmental water, swimming pools, water purification systems, etc.