diameter: 12.7 cm Width: 5.08 cm
Circular metal gauge without its glass front. It has an arrow pointer. The face of the gauge has numbers around the outside edge 0-200 in increments of 20, on the face of the gauge is the manufacturers information, "LBS PER INCH CSA MORRISON BRASS Mfg.Co. LIMITED TORONTO CANADA". There is a small threaded metal pipe coming from the bottom.