I recently purchased an Enercell Model 22-143 battery tester from Radio Shack. The package listed that it was compatible with button cells and hearing aid batteries.
To test a battery, you lift a right angle lever and then place the battery on a ledge at the lower left, moving the lever back in place. It is very cumbersome to do, even with two hands.
The contacts to not make proper contact with button cells. Small hearing aid batteries are impossible to test correctly. When I did make correct contact with a button cell, the reading on a brand new cell was ambiguous. It is a very poor design for anything less than a AAA battery.
This thing cost about $12. It is not suitable or worth the money.