This paper is a follow-up from our 2006 Klatzky et al. JEP- Applied paper. It definitively demonstrates that use of the Vibrotactile N-back method, first described in the 2006 article, is a valid technique to test working memory capacity. Results show that the Vibrotactile and auditory variants of the N-back task yield similar results across several levels of N, findings which open the door for this technique in future studies assessing cognitive load demands on working memory capacity (particularly for multimodal investigations).