I finally broke down and picked up the medium sized digital scale at Harbor Freight last week. It is the one that has a maximum capacity of 11 lbs. It set me back $20 on sale.
I have been weighing 3 blanks that have be drying for a couple months. I brought them out of the shop and into the house, so I knew they would lose some weight for a while, even if they were completely dry. So far I like this little scale. It displays to 3 decimal places in the lbs mode. It also has ounce and gram modes. They only drawback is the auto shut off feature turns it off after about 40 seconds if there is nothing on the scale. Sometimes I have to turn it back on if I am messing with a couple blanks. Not a big deal.
The oldest blank lost weight for a couple of days and then stabilized. The others are still slowly losing weight.
If anyone wants to be able to know when a blank is dry enough to final turn, and wants to use weight as a measure, this is an inexpensive way to get into it IMO. I believe the regular price is $25, but they are frequently on sale for $20. They have a larger scale with a max capacity of 70 lbs that goes for $40 on sale.