It's very rare for there to be a site with NO mains power available at least in my line of work (house badgering mostly with a distinct slant to faultfinding) so using a live circuit to prove the tester is often more convenient. But for when it's needed, I have a seward unit in the bag. Works well and reliably. The only bit I don't like is using the lever of the microswitch itself as one of the contacts, it's a less than ideal conductor and often you have to prod around to get a good contact. However that could be viewed as a feature I guess
It's very rare for there to be a site with NO mains power available at least in my line of work (house badgering mostly with a distinct slant to faultfinding) so using a live circuit to prove the tester is often more convenient. But for when it's needed, I have a seward unit in the bag. Works well and reliably. The only bit I don't like is using the lever of the microswitch itself as one of the contacts, it's a less than ideal conductor and often you have to prod around to get a good contact. However that could be viewed as a feature I guess
