Leveloggers record temperature compensated water levels. Groundwater and surface water temperature measurements are particularly important in situations where temperatures may fluctuate significantly, and when temperature is used in determining liquid level, viscosity and hydraulic conductivity. Temperature monitoring is vital in the calculation of certain temperature dependent contaminant reaction rates. A Platinum Resistance Temperature Detector is used to accurately compensate for temperature changes within the range of 0 to +50ºC for the Levelogger Edge, -10ºC to +50ºC for the Barologger Edge, 0 to +40ºC for the Levelogger Junior Edge, and +10 to +40 for the LTC Levelogger Junior. The Levelogger will record temperature in its thermal range of -20 to +80ºC, but outside the range, compensation will be less accurate.