Changes in the viscosity of hydraulic oil and lubricants due to the temperature require precise monitoring and stabilizing the operating temperature. Carefully monitoring the temperature further also affects the service life of the oils. The oil tank is generally accepted as the control point for the oil temperature, which will usually provide helpful averages. It may further be helpful to also monitor segments or individual units within a system. The values determined from the measuring points must be transferred to the system control according to standards. For safety reasons, it is advisable to at a minimum display the current oil temperature on the oil tank. The Thermotronik TT-77F offers accurate oil temperature measurement and display in one and allows a variety of programming options for the display and signal output. The Thermotronik TT-77W consists of a temperature sensor and the display unit for remote installation using the Easy Mount System and allows a variety of programming options for the display and signal outputs. The large range of system-compatible temperature sensors is tailored for use in hydraulic and lubrication technology.