Shane Horn, Canada
This is a "be prepared" story. While working nights, I got a call to our making system on the other side of the plant. While I was trouble shooting I was getting weird readings, and then I noticed the battery low signal on my meter. Of course I didn't restock the back-up in my case so I had to walk all the way back to get a battery, while the system was down, costing the company money. You should always check your meter before you start work and have a spare battery in your case!