We bought this item to specifically test all our button batteries. Maybe we did not read the description well enough but the specific button battery we wanted to test will not fit into any of the slots and cannot be tested. We decided to keep the tester so we can use it on other batteries but you will need to really read the description to see if it will work for you. Otherwise it works great. The screen has to be in just the right light to see it well. As long as you have good lighting you will not have a problem.
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