Dan,
It may interest you to know this in not "cheap junk" at HD. Years ago when
these devices first came out, they were about $90. Greenlee was the leader.
You perhaps have seen the Greenlee name. They are in the electrical business
and for years have made a lot of products. Those are not limited to their
hydraulic conduit knock-out (competing with Morgan and others), everything
wire and connectors, and all types of service components. They have other
divisions.
Some of the older models were yellow, flat, and always a shirt-pocket
device. This is the first one I have seen with an on/off switch, which
really is not needed, but there. It has replaceable battery.
This came out a few years ago and is not a new thing. The price however is
really good at HD compared to any other. It also makes a great learning tool
and fun toy.
-Eddie-
Houston, TX
----- Original Message -----
Home Depot, about $9.99, you will like it. See link below.
http://www.greenlee.com/product/gt-11/start.html