That tester looks pretty useful, C4166 or whatever, bet you either have one or have seen it. I also like the meter with the Mopar logo on it, tach etc., pretty cool. I thought the FCC warning for metal leads was pretty interesting. While working in a Motorola shop that supported a lot of public safety radio equipment my co-workers got called upon to sniff out interference, ended up being a Winegard RV antenna.
