B&K Precision 307A - Manual - Manual (Page 17)

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11. Battery & Fuse Replacement
11.1 Battery Replacement
Your Analog insulation tester's battery is situated
under the tester. The Bat. OK will not lit when battery
need to be replaced.
Disconnect the test leads from the Instrument,
remove the battery cover and the batteries.
Replace with eight 1.5V R6 or L6 batteries, taking
care to observe the correct polarity.
Replace battery and the battery cover.
11.2 Fuse replacement
The Fuse is located next to the Batteries.
To replace Fuse, proceed as per Battery
replacement to open the battery cover, then remove
and replace the fuse located under the battery
holder. Only replace with same specification fuse.
(0.5A)