Features Easy to clean, rugged conductivity cell module Measures Conductivity, TDS, Salinity and Temperature Non-interchangeable with ExStik® pH, Chlorine or ORP Meter Complete with protective connector cap ATC via built-in Pt-100Ohm sensor Specifications Conductivity: 0 to 1999μS/cm; 00 to 19.99mS/cm TDS (EC150 only): 0 to 1999ppm 0 to 19.99ppt Temperature: 32° to 122°F (0 to 50°C) 0.1°F/°C ±0.9°F/1°C Power: Four LR44 button batteries Dimensions/Wt: 6.5 x 1.4 x 1.3" (165 x 35 x 32mm) Weight: 3.8oz (110g) EC100 is a Conductivity/Temperature Meter. Waterproof meter with high-accuracy multi-ranging sensor. Features Auto Power off with disable. Units of measure include µS/cm, mS/cm, ppm, ppt. Featuring Adjustable Automatic Temperature Compensation. Includes meter, protective sensor cap, and four LR44 button batteries. Conductivity standards sold separately (required for calibration).