Good Digital Water Meter Wanted

Hi,

I currently sell a nice mechanical water meter for use when filling the
glider wings. It works great. The only thing it is lacking is the ability
to zero the meter. Therefore, you need to make note of the number before
you start filling and calculate what number you want to arrive at when full.
Also, it is quite heavy. You can see it he
http://www.cumulus-soaring.com/misc.htm#Water_Meter

I'm looking for a nice, accurate, small, simple, digital water meter that
can be reset to zero before you start filling your wings. I will stock them
and sell them - assuming I can get them at a good cost by buying them in
quantity.

Any suggestions?

Thanks,

Paul Remde
Cumulus Soaring, Inc.