On Fri, Aug 21, 2015 at 11:19 PM, Edward R Cole <kl7uw at acsalaska.net> wrote: When I need to know accurate power readings my best instrument is either > scope and good 50-ohm termination, or using my HP432A mw power meter. Its > about 1/2 dB accurate. Isn't "1/2 dB accurate" the same as "12 percent accuracy"? 73, Hank, W6SX