The Ply Bond Tester is designed to determine the internal bonding strength of paper, paperboard, and laminates. It measures the average energy, expressed in thousandths of a foot-pound, required to delaminate a specimen into two plies, in accordance with TAPPI T-569 reference standard.

The instrument is equipped with a dual-capacity pendulum of 0.25 ft-lb and 0.1–0.5 ft-lb, with readings indicated directly on a calibrated scale for accurate and easy interpretation. It includes a five-station specimen preparation unit, allowing testing of different specimen thicknesses with adjustable clamping pressures ranging from 50 to 200 PSI.