Basal Area Wedge Prisms are used for cruising timber.
There are two options in choosing a prism:
Rectangular (20 mm x 40 mm). Best for use in dense timber
Square (40 mm x 40 mm). Best for use in areas having less than a 15% slope.
Clear - for use in most cruising conditions.
Amber - for cruising in hazy, misty or low light conditions.
All of our prisms are accurate to +/- 1% of rated BAF (Basal Area Factor). They come in a soft, suede leather protective case.