For long life, all models are made of cast aluminum. To ensure smooth operation they are dynamically balanced. Dual switches for heater and motor, thermostat which automatically keeps the correct temperature in the chamber, and a mounted thermometer are all included. Whenever the heater or motor is in use, a pilot light will go on. The pilot-light and dual switches are mounted on top of the tester. Unit comes complete with dual switches, thermometer, thermostat, heater, control box, head and cups. Glassware is not included. Wired for 110-120 volt, 60 Hz. Warranty: 90 days.