If the on/off switch has stopped functioning (also if reset button is not working) then you will require a new piece
and here's some science to prove it: Water has a thermal conductivity of 0
it eliminates nearly all odors
Power Trowel Model: TRT46V
5 pounds or 3 cups per square foot
Salinity Refractometer - 0 to 28% HPS If the on/off switch hasMeasures salt content in sea water, pickling brines and other applications. While the scale is calibrated for sodium chloride, it can also be used for calcium chloride, barium cobalt, magnesium, cesium, potassium, sodium chloride, cupric sulfate, potassium iodide, citric acid, acetic acid and (vinegar). Place a drop or two of a sample on the prism and read the results. Sper Scientific portable refractometers work in ambient light with no battery or