When I was in high school I made a fuze tester. It consisted of a small plastic box with a screw-down lid, its about 2 inches wide, 3 long and 1 deep. I drilled 3 holes in the side of it. One of these was a hole for a green LED to stick through. The other two were the distance apart of the contacts on most common domestic or auto fuzes. Through those I put a small pair of screws, with nuts on the other side clamping the wires onto them. The screws then served as the contacts for testing a fuze. I then soldered together the LED, contacts and a battery holder for a couple of AA's, so that putting a good fuze (or any other metal thing) across the contacts lights the LED. I put a couple of batteries in it (I've long ago forgot what brand or chemical type they were), screwed the lid shut and took it home to show mom + pop. This was in 1992 or 93. I still have the fuze tester, it's been used now and then down the years, and those two AA cells have never been changed from that day to this. It still works as well as it did the day they were inserted.