Ohaus TP2611 [80621692] Triple Pro Mechanical Balance w/ Rod and Clamp, 2610g x 0.1g. The OHAUS TP2611 Triple Pro gives you the confidence to know you have the accuracy and convenience of a toploading balance while allowing your students to gain hands-on experience through manipulation of the poises, attachment weights and the rod and clamp assembly (all included). The OHAUS Triple Pro balance is the perfect learning tool to help students visualize mass measurement principles and to emphasize a hands-on approach to learning