A $1 real large display dual powered Calculator
from DollarTree works just as well...
( pressing + and 1, each time you press the
equal button, increments the total by 1)
Goes off after 8 to 10 minutes...so as long as
you don't take long breaks while winding a coil....
Watching the counter and thinking
of that $9 you saved is half the fun! LOL
( :>) Norm