|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 - +0.10 to 0 to -0.14” W