Eblock, best known for its locking system Easy Block, has developed a testing tool for opticians, which enables the correct mounting of lenses on Eblock frames. The tester is a handy metal tool that helps verify measurements while giving the optician the certainty that the process of mounting lenses on an Eblock frame has been done properly. The tester is shipped to Eblock clients accompanied by an instruction leaflet that explains the use of the tool in detail.