In the case of the TS100 it doesn't turn off, it just cools down. I've never had it guess wrong -- my hand isn't so steady that it will turn off while I'm usin

In the case of the TS100 it doesn't turn off, it just cools down. I've never had it guess wrong -- my hand isn't so steady that it will turn off while I'm using it. If it's on and on the table, it is still visibly ON so this is just extra safety if it's a little bit cooler.