The Dwyer Series 476A singlepressure digital manometer is used to perform singlepressure measurements and to set supply pressures, verify pressure switch operation, adjust regulators, check pneumatic systems, and computer peripherals. The meter is suitable for use with air and compatible gases, and has an accuracy of + or 1.5% of full scale. The extruded aluminum case provides durability. The fourdigit LCD displays the pressure measurement, and a zero function nulls minor pressure differences before measuring. SpecificationsPressure typesSingleMedia typeAir and compatible gasesCase materialExtruded aluminumPressure unitsinH2O, mmH2O, bar, mbar, psi, inHg, mmHg, kPaConnection type3/16 or 1/4 inside diameter (ID) tubingMaximum pressure5 gauge psiDisplayFourdigit LCDResolution0.02 (inH2O)Temperature limits0 to 140 degrees F/17.8 to +60 degrees CCompensated temperature limits32 to 104 degrees F/0 to 40 degrees CDimensions617/32 x 213/16 x 29/32 (H x W x D)Power9V alkaline battery (included)H is height, the vertical distance from the lowest to highest point; W is width, the horizontal distance from left to right; D is depth, the horizontal distance from front to back.Manometers measure the pressure of a liquid or gas. They are used in laboratory, medical equipment, engineering, automotive, and heating, ventilation, and airconditioning applications. Manometers measure any combination of gauge, absolute, or differential pressures. Gauge pressure is the amount of pressure in a system relative to the ambient pressure, absolute pressure is the amount of pressure in a system relative to an absolute vacuum, and differential pressure is the difference between two pressures. Analog manometers are composed of columns of liquid, and they use gravity and the liquids density to calculate pressure. Because they have no moving parts, analog manometers do not require recalibration. Digital manometers have pressure sensors that are connected to a system with a hose to provide a digital readout of the amount of pressure present in a system. They use microprocessors to calculate pressure, and they require periodic calibration to help ensure accuracy.Dwyer Instruments manufactures measurement and control instruments, including pressure gauges, flow meters, level instrumentation, temperature instrumentation, and air quality monitors. The company, founded in 1931, is headquartered in Michigan City, IN.