Spa Electronic Thermostat Assy, 24V Manf. Allied Innovations Manf. # 932020-001 Len Gordon Solid State Thermostat Accurate to 1/10 of one degree. Thermister is at the end of the sensing bulb, reducing the effects of ambient air temperature. Stand alone versions available in various voltages. Must be used to switch a relay or contactor. Max. rating 0.5 amp, 120v (neutral required)