Tektronix DMM150 Instructions Manual page 13

To replace the batteries, follow these instructions:
1. Disconnect the test leads from any circuit under test
and turn off the multimeter.
2. Remove the test leads from the multimeter.
3. Lay the multimeter face down on a work surface that
will not damage the multimeter face.
4. Remove the screw from the case back using a small
Phillips screwdriver.
5. Gently lift the the case back at the end nearest the
lead connections.
6. Lift the shield foil back to uncover the battery case.
7. Lift the battery case out of the multimeter, and
carefully remove the batteries.
8. Install the new batteries in the correct polarity
positions, and install the battery case into the
multimeter.
9. Fold the shield foil over the battery case.
10.Replace the case back. Make sure the battery leads
and shield foil do not get caught between the case
front and back.
11.Reinstall the screw.
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