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This models allow for the user to calibrate the IRt/c’s (IR thermocouple) to match a thermocouple in whatever temperature range they desire. The range adjustment screw is adjusted to calibrate for temperature range of interest and material properties (emissivity). Models for non-metals (HiE) and metals (LoE) are available. Sensor Range: 260 to 1650°C (500 to 3000°F) or 540 to 1930°C (1000 to 3500°F) Field of View: approximately 3° (20:1) Minimum Spot Size: -- No Aperture: 20 mm (0.8”) at <400 mm (16”) -- ½” Aperture: 13 mm (0.5”) at <230 mm (9”) -- ¼” Aperture: 6 mm (0.25”) at <90 mm (3.5”)