HI 933100 is a multi range conductivity/TDS meter with Automatic Temperature Compensation. It features a Range Conductivity of 0.0 to 150.0 µS/cm,150 to 1500 µS/cm, 1.50 to 15.00 mS/cm, 15.0 to 199.9 mS/cm and temperature range of 0.0 to 60.0°C. With 4 x 1.5V AA this instrument is capable of producing up to 150 hours of continuous use in an environment between 0 to 50°C (32 to 122°F)and relative humidity up to 100%.