...The combination of double-wall girder and extra thick baseboard provides extreme rigidity and resistance to vibration...With the extra long column, enlargements up to 16x 20 can be made on the baseboard, while even larger magnifications are possible by reversing the column and projecting onto the floor...

...It is therefore useful where the maximum magnification on the baseboard is limited by the length of the enlarger column or ceiling height restrictions...

...With the extra long column, enlargements greater than 11x 14 can be made on the baseboard, while even larger magnifications are possible by reversing the column and projecting onto the floor... large 16 x 20 laminated baseboard up to 11 x 14 size prints on the baseboard for even larger prints, column can be reversed for floor projection disassembles easily for storage optional ...

...In use, you place the tool on the baseboard in one direction and adjust the level to center the bubble...Then place the tool on the negative and lens stages in the same orientation to check the alignment of those stages compared to the baseboard...