I bought this to speed up my mini router, Check and adjust mini lathe and drill press to ensure they have correct feed and speed ratios. I didn't follow the instructions and I was sure that the product would not work - my bad. I wasn't able to put a piece of tape on the chuck for the pickup function. I cut a 1 inch piece of tape and installed it on the chucks and everything is fine now. This tool allowed me to tag my machines for RPM and now use it to set the correct speed when assigning a project. The price is fair, the case is good for protection and storage in the closet.