The dial gauge is a an indicating micrometer gauge that measures the penetration of the indenter under the applied load. The dial of the gauge can be rotated by rotating the outer ring of the face.

That makes them easier to read than the scale on a stick-type gauge. Some digital readouts light up. That's handy for checking pressure in low-light conditions. Dial gauges, the other main type ...

Ohio State University Extension is hosting pressure canner gauge testing at various locations and times throughout northeast Ohio this spring.