Tank profiler is a sensor with an antenna on the end of a measurement tape and the electronics (transmitter) encased in the sensor. The sensor can be lowered and raised in a tank to make measurements of the process at various elevations. The sensor sends a signal back to the reel assembly, which has an electronic module that converts the signal to a percent water reading. It is also capable of making process temperature measurements from 0º to 80º C. The electronics have the capability of storing information from several tanks. It is an industrial instrument for measuring emulsion and temperature profiles. This unit measures not only level/ullage and organics/water interface levels, but also the percent water concentration in the hydrocarbon or organic layer/emulsion.