GazCro
Well-known member
There are no moving parts in a cable detector so realistically as far as i can tell they either work or not. When you send it away to be calibrated or do it yourself with downloaded programme all you are doing is checking it is working within its design parameters. If you've sent it away to a proper place they will likely fix it if it's not correct which you can't do yourself. If you use cat and genny regularly imho you should know if its working or not.