Handheld Digital Barometer measures altitude, temperature, and barometric pressure. Also has a stopwatch/time of day clock and graphically displays the barometric pressure trend. 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. Altitude is displayed in meters or feet. Reading is updated every 2 seconds. Features a minimum/maximum memory for the altitudes reached during any time period.Temperature display is updated every 10 seconds. Clock displays the time of day to the minute and shows the date and month. The clock also features a format of 12-/24-hour timing and an alarm.