Leveloggers record temperature compensated water levels. Groundwater and surface water temperature measurements are particularly important in situations where temperatures may fluctuate significantly, and where its accuracy is important 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 5 and Levelogger 5 LTC, -10ºC to +50ºC for the Barologger 5, and 0 to +40ºC for the Levelogger 5 Junior. The Levelogger will record temperature in its thermal range of -20 to +80ºC, but outside the range, compensation will be less accurate.