Handcrafted in the USA, The Stealth Jr. Digital VDS is equipped with a laboratory ISO certified and calibrated digital module thermometer display. The vaporizing temperature is controlled by manually adjusting the temperature control knob and monitoring the temperature through the digital display. This unit is equipped with an all glass heating element, laboratory grade borosilicate glass chamber and glass whip, medical grade tubing, and a large glass mouth piece. All Vaporfection Stealth models have the same glass on glass heating element and all internal components are manufactured to uphold our high standard of quality control. All units are individually tested at our facility before shipping.