PrecisionmachinisT wrote:

My old Triplet 630 seems to work just fine for this and since the "B" cell only needs replacement about once every 30 years......


It's perfect, if you never do any precision work....

It has two 'Batteries', B1 & B2.

B1 is 30 Volts (NEDA 210) which costs about $40 these days.
B2 is 1.5 Volts


Not suprising that you don't know the difference.