BENTLY NEVADA · 21000 SERIES 21000-15-10-00-166-03-02 Proximity Probe Housing Assembly Configured 21000 aluminum proximity probe housing assembly with a 300 nuclear probe configuration, 1.0 m probe cable, no standoff adapter, 16.6 in probe penetration, specified fittings, and a 3/4-14 NPT mounting thread. System Role External mounting for a proximity probe Bently Nevada describes the 21000 as an all-metal proximity probe housing assembly for external mounting of proximity