Delmhorst 21-ET/001 - Deep Wall Probe with Tapped Handle - 6 1/4" Penetration
The 608 pins that come with the 21-E are insulated, except at the tips, and can reach a maximum penetration of 3-1/4".
Great for use on roofs, insulation, or EIFS.
21-E is also available as the 21-E/001 with 6" penetration, or as the 21-ET with a tapped handle for hard to reach areas.