Digital Angle cubes or digital inclinometers are by far the best way to meaure your angles consistently when sharpening. This digital angle cube features an all-aluminum housing with a magnetic bottom and sides, function buttons for on/off, zeroing, holding an angle reading, toggling from protracted angle to tilt percentage. Specs: Measuring range 4*90° Resolution: 0.05° Repeatability: 0.1° Accuracy: ±0.2° Working Temperature: 0°C-40°C (32°F-104°F) Humidity: <80% Batteries: 1 x 9V Of course this angle cube is compatible with any sharpening system, such as the Jende JIGS, KME Sharpener, Hapstone, Edge Pro, Wicked Edge and TSProf, etc. It can also be used as a handy angle cube around the house and workshop or mancave
