I've also got the Kane one, came with my 455 kit. Looks a bit like a kid's toy, bright yellow plastic. However, I've used it twice in anger, and both times it's picked up minute leaks that didn't cause LDF to bubble. You have to be a bit careful as it's very sensitive and will react to LDF. I let mine stabilise in the general area of the leak, so that it's a bit desensitised if that makes sense. Then it will only pick up higher concentrations of gas.