I put a link below. I found out by watching demos of it on YouTube. A mechanic I use has it and he uses it more than his £3000 Snap on. Was a bit sceptical when I first saw the demos, then the price but after seeing him use it I’m going to get one.
https://rover.ebay.com/rover/0/0/0?mpre=https%3A%2F%2Fwww.ebay.co.uk%2Fulk%2Fitm%2F192949318786