Grizzdaddy there you have it concerning the "Gizmos" from Rodney and of course I fully concour with their functionality as well as his explination of their use.

I have just never used them and I continue to train all my students however in the use of the loaded meter and the Morning check before transport, morning check before first flight and a check between each flight of the day senario. Here is why:

For the gizmo to work one must be installed in every single aircraft. Now no problem for just your first airplane but a five or six bucks a whack or whatever they are now, it will begin to add up as you add airplanes. Make no mistake if you stay in the hobby you will start adding airplanes. Next thing you know you will have some airplanes with and without the gizmo and ultimately most all peope will eventually just add the very important loaded voltmeter.

In the real world only a small minority of folks will end up with a Gizmo in every airplane in lieu of a good meter.

Now all of the above is only just my opinon and what you need to do here and now though is make sure by whatever method you choose that you do not go any lower than the afformentioned 4.7 volts (with a metered load).