1. On the battery to be tested find the positive (+) polarity mark.
2. Insert battery into proper size slot with positive (+) side down.
3. Push down on the blue panel and hold for several seconds.
4. Read the meter to determine the condition of the battery.
Purchase includes: 1 Activair Battery Tester
A consumer-style battery tester. Separate size slots for each type of battery.
Use with hearing aids
Brand: Serene Innovations
1 year manufacturer warranty