Used by NHL equipment managers as seen here, including the Montreal Canadiens  https://youtu.be/F0eAdxM4rCo Other edge checkers from Blademaster etc can cost up to $250 Made in Canada, ships from Canada. Will work with all skates and models (Hockey Goalie) & Figure (Except Parabolic & Matrix) This device will allow you to check and see if your skates are even after sharpening. Comes with a hard protective case so you can keep it safe in your hockey bag. A must have if you travel a lot for hockey and go to tournaments so you can check if the work was done properly. Or just check the work from your Local Hockey Shop. This will tell you if your sharpening is accurate. Also, very useful if you have your own machine at home. One great feature of this tool is that you can check most skates without taking them off the holder. Lastly, It is also great for checking blade life on hockey skates. When the top of the forward part of the edge level get in line with the red dots, it's time to change your blades or skates. (See last image) Please note last image is a used device for illustration purposes only. You will get a brand new device.