This patented AngleMaster has two functions: You can use it to set the jig to the grindstone so that it grinds your tool to any desired edge angle from 10 degrees to 75 degrees and you can use it to measure an existing edge angle on a tool.
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The AngleMaster is designed to work on any grindstone diameter from 250mm (10in) down to 150 mm (6in). You achieve an exact setting irrespective of the degree of stone wear.
The AngleMaster has two magnets for convenient fixing onto the housing of the machine.