The LIF 481V, LIP 481V and LIP 481U are linear encoders for use with vacuum technology. The first two models are for high vacuum to 10 to 7 millibar, the latter is for ultrahigh vacuum up to 10 to 11 mbar. The LIF and LIP encoders consist of a glass scale, scanning head and the interface electronics. The cable between the scanning head and interface can be up to 3 meters in length. The vacuum compatible interface electronics can be placed either inside or outside the vacuum chamber. Available encoder accessories include fixing clamps, fixed point holders, vacuum feedthroughs, vacuum-compatible epoxy and extension cables.