The RC-26GLP open bath chamber has a volume of 234 u l (0.234 ml) per mm of solution height above the base coverslip.

The horizontal outline of this chamber is identical to the RC-26G.  However, the total height of the bath in RC-26GLP is 2 mm (as compared to 4 mm for the RC-26G).  The shallow bath enables easier electrode access to the sample when using close objectives.