Bacharach Draft and Pressure Gauge part #13-3000
The pocket draft and pressure gauge can be conveniently held in one hand when being used . The free-floating pointer indicates sudden changes from draft to pressure from “puffbacks”. Suitable for checking flue pipe, chimney, fire box, smoke hood, etc, including basement ventilation. Reads .1 to 0 to -0.14″ W. Other models available. Comes with two sections of draft tube and leatherette case.