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This Bachmaier LCD battery tester with its bar display is useful for use as a quick check.
It is a small, convenient battery tester to quickly determine approximately how much power is left in the hearing aid batteries. The digital LCD display uses a bar graph to how the charge state of the battery.
Suitable for all common hearing aid battery sizes. 
                  
The LCD keyring hearing aid battery tester comes complete with a sliding storage drawer for two spare batteries (batteries not included).
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