Cecomp Electronics, CTP1B5000PSIG-NC, CTP1B Battery Powered Digital Pressure Gauge with 1 Button Operation and NIST Traceability Documentation, 0-5000 PSIPower-UpPress and hold the front button for approximately 1 second. The display is tested, the default full-scale range is indicated, the full-scale range in the selected units are indicated, the display is tested again, then the actual pressure and units are displayed. The back lighting will turn on for 1 minute and then automatically shut off. Display back lighting can be turned on by momentarily pressing the power button whenever the gauge is on. This also restarts the auto shutoff timer. The display back lighting will not be apparent under bright lighting conditions.Power-Up with ZeroAbsolute reference gauges do not use the zero feature since they read atmospheric pressure under normal conditions. Be sure the gauge port is exposed to normal atmospheric pressure and no pressure is applied. The zeroing function is only activated at each power-up and the stored zero correction is erased when the gauge is shut off. Press and hold the front button. The display is tested and then oooo is displayed. The gauge is now zeroed. Release the button and the full-scale range in the selected units are indicated, the display is tested again, then the actual pressure and units are displayed. Attempting to zero the gauge with pressure greater than approximately 3% of full-scale pressure or vacuum applied will result in an error condition, and the display will alternately indicate Err 0 and the actual measured pressure. The gauge must be powered down to reset the error condition.Shut-DownTo shut off the gauge manually at any time, press and hold the button until the display indicates OFF (about 5 seconds) and then release. When an auto shutoff timer is used, the display indicates OFF five seconds prior to auto shutoff. The button can be pressed to keep the gauge on. The auto shutoff and backlight (if equipped) timers are reset whenever the button is pressed and released. If the gauge is set up without auto shutoff (on/off operation) it will stay on until manually shut off or until the batteries are depleted. Turn gauge off when not in use to conserve battery life.OptionsNC - NIST traceability documentation, 5 points and dateRed rubber boot White LED backlight All metal case Port reinforcement Coated circuit boardsFeatures:±0.1% Test Gauge Accuracy in Most RangesUltra-Ruggedized Design316L Stainless Steel Wetted PartsSelectable Units and Auto Shutoff TimesWhite LED Display BacklightMin/Max Memory.