On Monday, 17 July 2017 11:05:20 UTC+1, wrote:

I do have to ask, why these meters used BOTH the D cells and other
batteries as well. (In other words, more than one kind of battery). Why
didn't they just use one battery or one set of batteries for the whole
device?

A 1.5v cell is high capacity, high current & cheap. 15v batteries are low capacity, low current & never cheap.


NT