Traceable® Manometer/ Pressure/Vacuum Gauge Manometer displays gauge and differential pressure/vacuum in eleven different units. Response time is 0.5 second. Simple hose fittings on the unit permit using hose/tubing with inside diameters from 1/16 to 3/16 inches. Large 5/8-inch high digits are visible from six feet. At the touch of a button unit may be zeroed or any pressure may set to zero. Differential feature permits reading the difference of the pressure or vacuum between two different sources. Memory feature recalls highest and lowest reading over any time period. A count up timer displays times up to 99 hours, 59 minutes, 59 seconds. A DATA HOLD key "freezes" the display to capture readings. Brilliant backlighting permits reading even in dark areas. In the calibration mode the user may set the pressure/vacuum to any known pressure/vacuum. RS-232 serial computer output permits the units to be connected to a computer for monitoring and storing results. Accuracy is ±0.3% of full scale at 25°C. Traceable® Certificate is provided to indicate instrument traceability to NIST. Supplied with Traceable® Certificate, hose/ tubing, 9-volt battery, RS-232 serial computer output and ABS plastic carrying case. Size is 2-3/4 x 7-1/8 x 1-1/8 inches. Weight is 5 ounces.