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 - +2.5 to 0 to -3.5 mm W