if you're bucks down, you ought to get
the lee safety scale and the dipper set.
i have dippers and scales and use both
at different times depending on situation.
if you will learn to read vernier calipers,
or even a dial caliper, your battery worries
will be over.
i've used the dippers for quite a while and
would be comfortable if i had nothing else.
good luck- post if you need free advice