Maximum Registering Thermometers (Thermco)

For applications such as monitoring the highest temperature of an autoclave or dishwasher cycle, a maximum registering thermometer will hold the highest temperature reached. The column of mercury will not recede into the bulb until shaken down like a fever thermometer which should be done before each new measurement. High precision “max reg” thermometers such as these should be read within 3 minutes of end of cycle for top accuracy. Comes complete with open face metal armor case (only shake down when firmly enclosed in case to avoid snapping).

NOTE: Maximum registering thermometers always have a separated liquid (mercury) column. The liquid passes through a “gate” at the constriction in the glass tube allowing it to pass through until the highest temperature is reached and cannot return below the gate until the thermometer is shaken down to reset. Do not try to reunite the mercury column, just shake the column down to room temperature to reset the thermometer.

Mercury may be banned in your state – please check your state laws before ordering mercury thermometers.

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Frequently asked questions