The AGF-TOP and AGF-ZGV are technically almost the same in many ways. ​But the AGF-TOP has one important feature on top of the AGF-ZGV. It comes with an extra writing strip strip for personal markings. new 9.5“ extension made of anodized aluminium, rounded shape for ideal vibration damping, laserprinted scale. new side mount block, according to the international standard. new handy locking knob