The NAF2 is one of two new accessibility probes required by UL 60950 for paper shredders. UL found that children and small women could touch hazardous parts of some shredders. The other probe now required in the standard is UL Articulated Finger Probe, Model ULP01, ULP04 or ULP20
This model NAF2 is mostly made of aluminum to conserve weight. The tip is made of stainless steel because aluminum is too soft to withstand possible contact with the cutting blades.
The probe is electrically conductive as required in the standard. Also there is a threaded connector in the handle to accept either a force gauge or a banana plug wire connection.