Traceable® precision dial barometer’s triple scales provide a sensitive measure of atmospheric pressure. To assure accuracy an individually serial-numbered Traceable® Certificate is provided from our ISO 17025 calibration laboratory accredited by A2LA. It indicates traceability to standards provided by NIST (National Institute of Standards and Technology). Housing is rugged corrosion-proof, nickel-chrome. Adjustable pointer may be set to indicate changes. Complete with altitude adjustment screw (use at locations as high as 1000m ), notched desk stand, and wall mount. Size: 4 -1/8 dia. x 1-1/2-Inch. Atmospheric Pressure Range: 954 to 1073 mbar, 28.1 to 31.7in Hg, and 715 to 805mm Hg. Resolution: 0.5 mbar; 0.05in Hg; 0.5mm Hg. Accuracy: ±0.5% of reading. Response Time: 1 to 4 Hours. Weight: 1lb. Control Company#: 4199.