It's very important to keep a sharpening angle consistant when sharpening knife on Hapstone Pro knife sharpener. The angle should not change when replacing one sharpening stones to another with different thickness. It's recommended to maintain sharpening angle set by the manufacturer. In order to control the sharpening angle, Hapstone Pro user measures the angle between the horizontal shaft (where a sharpening stone is attached) and the working table with a knife.
The digital angle gauge is very easy to use. Please the gauge on working table (base) of Hapstone Pro and press the "Zero". The level of the base becomes zero angle. During sharpening process, attach the gauge to horizontal shaft, and it will show you the sharpening angle. Measuring accuracy is 0,2°.
If you prefer to use the angle gauge with Hapstone permamently, you can purchase supplementary holder for angle gauge.
If you have a question regarding this product, please feel free to ask.