Welch Allyn Braun PRO 4000 Thermometer and Dock Cleaning Instructions - Quick Reference Guide User Manual
Page 2
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All of the contacts should be cleaned using a cotton swab slightly dampened with isopropyl alcohol.
1) Clean the two contacts on the end of the thermometer:
Braun external contact view.
2) Remove the battery pack. Clean the two battery contacts (springs) inside the
thermometer:
Braun internal battery contact view.
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