Probes for digital temperature meters, monitors and controllers. Thermocouple probes, RTD probes, thermistor probes, general-purpose, penetration and air/gas, surface, flexible insulated wire, and other specialty thermometer probes. Conductivity or TDS probes measure the concentration of soilds in a mixture. All cells feature built-in temperature compensation and are housed in a lightweight removable probe guard. Choose from three different cell constants and replacement electrodes for portable Testers are available.