Non-reflective, matte gray coated baseboard with printed fine grid and centimeter and inch scales. The guide column is made of matte black anodized aluminum profile. Height adjustment is achieved through a plastic-mounted friction drive with a hand crank. The camera arm is horizontally adjustable to change the distance from the guide column (adjustment range approx. 7 cm). Connection thread B 1/4. The column can be folded flat against the baseboard.