I looked around the net and there are several inexpensive DC Clamp meters but they are all shipping from China and will take 3-4 weeks. Luckily, I had purchased a G.T. Power Watt Meter a while back but never opened it, I was actually able to find it in the shop. I think I can get this wired and working today and then might get one of the cheap ones just to have although I'm not sure if I need it since I have the Watt meter. One thing I like about the clamp on meters is the HOLD feature. This allows you to freeze the amp reading on the screen but for getting a quick idea of how much a particular motor/prop set up is drawing to check the battery sizing the watt meter should do.
Just found out that the Watt meter holds the data as long as it has power from the battery this does everything I need.
Best, DennisT