ETS-Lindgren HI-6153 Electric Field Probe - Manual (Page 63)

Battery-Operated Field Probes: HI-6053 Field Probe | 63
6. A single connector attaches the two boards together. Withdraw the two
boards from the housing at the same time. The boards should easily
slide out of the tracks.
7. Detach the two boards by carefully separating them at the connector,
avoiding damage to the pins.
8. Replace the four AAA rechargeable NiMH batteries, orienting the
+/- ends as indicated.