They are not the same as the old Square D ones, the Martindale one I linked to have neon indicators and don't vibrate on AC. Also on the same page is a proving unit (which I also have one of) which is used to test the probes before and after use. At work I have a set of UK issue steinel combichecks which are also GS38 approved, they have a self check function but we tend to use a socket to prove them.Spark123, those GS28 testers you linked to look like a square D mechanical voltage tester some of the guys at work had, it used to be that you had to have one in our workshop. Do you have to have one of those as well a multimeter then?
Never ever use a multimeter to test for dead. It can be set wrong or misread. Don't buy a fluke T5 or another multimeter in a different package which needs to be set.
Fair enough mate, after they stopped supplying voltage testers at work, all we have is a multimeter. So that's what I'm used to using to check circuits, etc.
I've had my fair shair of shocks, not always my own fault. Either way it teaches me to double check, and even then I'll often arc out to be doubly sure