TOPICS Products Guide TERRA-TECH, INC. 1-1-A1208,Sanda-Machi Hachioji-City, Tokyo 193-0832 Japan TEL: +81-42-662-4122 FAX: +81-42-662-4120 info@ttij.com	Measure from any unobstructed sighting position and at any height on the tree-stump, dbh or merchantable height. Two pentaprisms,mounted in a tubular metal frame,permit simultaneous viewing along pararell lines of sight. The prism on the left side is fixed while the right prism is movable long the measuring scale.