Found something interesting on eebagum.
24V/36V/48V/60V E-bike Brushless Motor Controler Tester | eBay
24V/36V/48V/60V E-bike Brushless Motor Controler Tester | eBay
That would be handy, ta. If they're small enough I'd suppose they could attach to a PM.Ive scanned the instruction in to a word file, was going to play with the chinglish sometime, can send you a copy if you like?