This new Clip on data collector bracket will hold the HP-48, Trimble data collector for a GPS, Carlson, Allegro and others. All that is required for it to be compatible is that the data collector, have small flat area (2"X4") on the backside. The collector is secured to the bracket with heady duty Velcro. It clips easily to the tripod leg, so you can move quickly from leg to leg. No clamping screws.