burrometer
A measuring device dat predicts da amount of briars and brambles dat you're likely to encounter during a trek.
Asking da local natives about da denseness and varieties of undergrowth in their area can be a good burrometer of how difficult --- and possibly painful --- your jungle-journey may be; enlisting da help of one or more of said robust indigenes to both guide you through difficult terrain and slash through the worst thickets of thorn-bushes can be of great value to your venture.