Duct mount products are mounted on or inside HVAC ducts in order to measure and control an entire air-handling zone. Features include: several mounting options, including duct probe, duct mount pitot tubes, auxiliary duct enclosure, or factory installed, display and no-display options, output options including 0-10 V, 0-5 V, 4-20 mA or relay output, finally, zero maintenance self-calibration via patented ABC Logic.