After reading many internet 'reviews', the Ring RAC635 came out as the most applauded. Now after more than a year and a bit of use I can add my penny's worth. Clear digital display, long cables, sos light, preset the pressure required and it stops when reached, quick inflation, sturdy construction, small size, handy carry case and most of all accurate. Just my opinion. With regards to the accuracy, I compared it to a Halfords digital tester which is rated as accurate and they return the same results. All for about £28. Phil