These are extra heavy duty models. The rear rollers are raised to prevent the wheels from being lifted out of the rollers. In this way higher brake forces can be obtained before the wheels lock.
Standard readout units are 800 x 1000 mm with 180° scale and large 100 mm LED’s. Also available are readout units 1000 x 800 mm with 320° scale, or monitor versions. Even configurations with analogue and monitor readout units are available.