Dri-Eaz Instrument Need Key features GE HygroTrac™ Remote, continuous monitoring of moisture levels and ambient conditions Double-stage cycle both generates and removes ozone Fully automated controls & LCD display GE Psyclone Handheld, instantaneous moisture readings Fast and accurate Easy-to-read display, intuitive controls HydroSensor® I & II Quick detection of moisture migration in carpets and pad Saves knees and back -- no leaning Simple, straightforward design