There are two Prisma options offered for your HPEII system:

#1. Prisma 120∞ for rubber rolls of ÿ 10 – 40 mm for HPE / HPE II part #: fm02061-x
#2. Prisma 150∞ for rubber rolls of ÿ 40 – 100 mm for HPE / HPE II part #: fm02062-x

The Prisma is designed to create a perpendicular angle of measurement against your round specimens. The correct option will depend on the dimension of your specimens.

Diagram of Prisma to HPEII System