Precision temperature control within -70C to +225C, DUT sensor, internal air dryer, movable arm and thermal test head, programs up to 10 temperature and soak times per test cycle, stability and repeatability of 0.5C, transition time 12 seconds -55C to 125C or 125C to -55C, soak timer ensures device under test stabilizes prior to start of electrical test, IEEE-488/RS-232, 208v.