What are the advantages and disadvantages of chamfer and countersink gages? Both the chamfer gage and the countersink gage consist of a plunger and a ratio indicator, but they come with distinguishing advantages and disadvantages. The chamfer gage has a relatively long range and is also versatile in its measuring abilities. The chamfer gage can also be set against any flat surface such as a gage block, the face of a ring gage, or a surface plate in order to master it. However, the chamfer gage comes with an indicator that uses a revolution counter. With its long range, this means that on a dial chamfer gage you must count each revolution on the dial in order to get your final reading. Additionally, another disadvantage of the chamfer gage is that you do not get as precise a fit into the bore you are measuring due to the range of diameters you can measure. A countersink gage has the advantage of being 1 revolution, direct read, and therefore you are not required to count the revolutions like you are on the chamfer gage. Also, the countersink gage provides both a measurement of form and diameter after each use. The disadvantages of this type of gage include not being able to master the gage on a flat surface. Due to the small range of this device, a sharp-edge ring gage must be used to master it. Finally, the countersink gage is so specified in range that you will need to own a number of them in order to cover a larger measurement range.