If the on/off switch has stopped functioning (also if reset button is not working) then you will require a new piece
Power Trowel Model: TRT46V
Output Water Temperature 41-203°F/5-95°C
A quiet fan system designed to be mounted onto wall or floor registers to boost airflow
LIFE provides the nutrient inputs required in early root development
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