Not sure what I am doing wrong. I have an LPL 4550 XLG with the Heiland Splitgrade and every time I measure a reasoanble looking negative it comes back with "Check contrast" and a measure of .5 or less. So, it can't determine what to do. Some other "factors" --Using Polycontrast RC --Using a Thomas Duplex safelight (its quite brite and doesn't fog the paper but is this something that could contribute? If anyone can help with the specialized equipment, please e-mail directly or ask questions in this forum. Thanks very much.