$5 estate sale bucket buy. I wasn't sure what was in the bucket, but I saw some small metal rules, calipers, and dividers, so I added the inexpensive spring clamps and the HF digital caliper to round it out. When I pulled everything out to look at it, I found 5 Starrett tools, a Craftsman caliper, and some other goodies. I put a new battery in the digital caliper and it worked perfectly.