Pressure Vacuum Generator, For Use With Manometer, Multimeter, Function Calibrate or Test HVAC Air Flow Sensing Switches Set Points, +/-0.1 to +/-12.0 in WC, 1/8 and 1/4 Adapter Thread Fitting (F)NPT, Features Separate Coarse Adjustment Valves for Initial Pressure, Vacuum Range Selection and a Pushbutton On/Off Switch, Battery Type (3) AA, Includes Protective Cover
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