Model 1771 Electrode Holder with Straight Clamp holds electrodes from 0.4 mm to 3.8 mm diameter.
Model 1771-A-Mod Electrode Holder with Straight Clamp modified with pad holds electrodes/glass from .092 to 2.325 mm diameter.
Models 1770, 1771, 1773 and 1778 have precision molded plastic block with serrated grooves 1 mm apart. These separations are on three sides to facilitate loading of electrodes. Clamping design allows more than one electrode to be held on one side of the holder.