Ideal for measuring low differential pressure in clean rooms, test and balance, medical equipment, HVAC, pneumatic systems and computer peripherals. Portable, and weigh only 5 oz. (150 g) including the battery. These meters are convenient for use in the lab, field or factory. All read gauge, and differential pressure in up to 11 units of measure and feature large, backlit displays, min/max, hold, and auto power off functions. The USB output port enables communication with a computer. High accuracy of ±0.3% FS @25ºC, repeatability: ±0.2% (max ±0.5%) FSO, and combined linearity and hysteresis: ±0.2 (Max ±1.0%) FSO. In order to connect this model to a computer to stream data, you will need the USB Cable 840054 and Data Acquisition Software 840052. All Sper Scientific Manometers come ready to use with connection hose, instructions, and a 9V battery, in a hard shell carrying case. Uses optional AC Adapter (840027).