The Stabila NL Telescopic Levelling Rod is made from anodised aluminium It is extendable up to 24m with a scale in mm graduations The adjustment slide ensures optimal display clarity and trouble-free height definition Suitable for all STABILA laser receivers and receiving units How To Use 1 Align the rods zero mark to the laser beam 2 Move the receiver on the levelling rod to bring it back in line with the laser beams height at the new measurement point 3 The height difference plus or minus can now be read from the NLs scale