This
pocket sized test instrument can be conveniently held in 1 hand which
makes it perfect for heating contractors & service technicians. The
free floating pointer will indicate sudden changes from draft to
pressure which are caused by 'puffbacks'.
Great for checking
flue pipes, chimneys, fire boxes, smoke hoods, smoke pipe drafts, draft
regulators, oil burner firing rates & basement ventilation.
Range - +1.5 to 0 to -6.5 mm W
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