Our DFP450W Digital Pocket Test with adjustable Temperature Alarm was specifically designed for the harshest foodservice environments. The Instrument can be programmed to provide a visual alarm (blinking display) once the set temperature is reached. The initial default alarm temperature is 140oF (60oC). Potentially hazardous mercury thermometers are often used to check the extreme water temperature of commercial dish water. Eliminate the risk of a mercury spill; the DFP450W stores the maximum heat registered and is waterproof. Guaranteed Accurate for Life means there is no need of field adjusting of calibration settings and no risk of introducing error into the instrument.