OP is spending her own money to purchase calipers for hobby use at home. "Employer" and "office" anecdotes are not relevant to her situation.

And oh by the way, (you can buy qty=100 batteries for those digital calipers, and pay just $6.45 with free shipping) from amazon.com. That's what I did when my cheapie digital caliper arrived, and I saw which battery type it used: 1.50V button cell, 11.6mm diameter.

If you manage to use up all 100 coin cells without remembering to reorder, and desperately need one ASAP, they are sold in the photo+camera section of your drugstore, ask for Eveready A76.