Solar-powered digital thermometers from Palmer Instruments are a direct replacement for industrial mercury-in-glass (MIG) and bimetal thermometers.“It doesn’t require any batteries. It doesn’t require any line power,” says Tadd Ayers, product engineer for Palmer Wahl Instruments. “You just have to have 10 lumens of light and the unit will come to life and function.”Completely mercury free, the environmentally friendly thermometer with high-impact ABS case is available in a base model (PST500) or with 4-20 mA transmitter capability (PST550) for connection to a remotely installed controller or recorder. The transmitter has a temperature range of -58 to 302 degrees F and
