For accurate measurement of pressure, pressure differential or vacuum to 2% of full scale. Measures air, filter resistance and gas and static pressures. Surface and flush mounting. Zero-adjust screw cover. Checks on control equipment, automatic valves, and gas air ratio controls, 1" - 10" faces (high end).

Measures and records temperature from - 20 to 120°F, +40 to +110°F, relative humidity from 0 to 95% (Non-condensing). Accurate to within c 1.8°F for temperature; ± 2% from 0 to 60%RH, ± 3% from 61 to 95%RH. 1, 7 and 31 day recording time. AC adapter, 4" D batteries. Microprocessor control and electronic sensing.

Relative humidity and temperature in -20° - 100°C and -4°- 210°F. Accurate ± 3%, Dial range 0-100%. 1 year guarantee and 5 year warranty. Solid brass. Wall mount no calculations, 6" overall