The Extech MO290-EP is an Extension Moisture Probe with dual sharp pins. The pins measure 8.5 cm (3.4 in) long, and a cable length of 76 cm (30 in). Moisture Probe can be used with MO290-EXT Moisture Probe Extenders to increase the working distance of the probe up to 58cm (23 in) when 2 extenders are combined together.