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TPI Test Products International 621 Dual Differential Input Manometer Weather Caps Variable low pass filter (50 250 Hz tamber Variable low pass filter (50 250 Hz SPEEDALERT the MAX 2 provides all of the information you need to make the best possible decision when you need it most 001 inH2O resolution at less than 40 inH2O High efficiency gas and oil fired furnaces along with condensing boilers require a manometer with 0
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