Digital Indicator permits indexing exact focus position for CCD photography. Kit fits all Tele Vue telescopes with 2" focusers that have pre-drilled holes in the focuser body and draw tube. Digital indicator reads with 10 micron accuracy, has 0.5" motion range and accepts RS-232 output cable for displaying readout on computer. TVFocus software (freeware) displays digital indicator reading on computer display through Indicator to computer RS232 cable (RSC-2320).