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Handheld digital barometer measures altitude, temperature, and barometric pressure. Also has a stopwatch/time-of-day clock, compass and graphically displays the barometric pressure trend. 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). Measures barometric pressure from 8.85 to 32.45 inches of mercury (inHg) with a resolution of 0.01 inHg and from 300 to 1100 millibars (mbar) with a resolution of 1 mbar. Accuracy is +/-8 mbar at tested points. Barometric pressure trend shows current reading and previous 2-, 4-, 6-, 8-, 10-, and 12-hours in bar-chart format. Barometric pressure reading is updated every 15 minutes.