Standard Mechanical Thermostat
This classic design will fit most spas. The temperature probe (sensor) is 3-3/4" long by 1/4" thick and on a 36 inch malleable coil. If you don't require the entire length, simply leave it partially wound up.
Solid State Thermostat 110 V
This solid state thermostat is accurate to 1/10 of a degree! Maximum rating is 1 Amp (pilot duty only). The temperature sensor is 2" long by 5/16" thick and on a 24 inch cord.