macbeth rd915 densitometer/ color analyzer

Hello everybody,

So ive been looking through my collection of stuff that ive gotten off of craigslist, and i remembered my macbeth densitometer. I guess i really dont know a thing about, and it didn't come with a manual. the model is a RD915

ive searched on here, and other sites, and only come up that it is a reflection (for paper) densitometer. so what else is there to know? how do i use it?

-Austin

There may be something helpful in this:

thank you for the response, but it doesn't even recognize the rd915... i did however see an rd917 on ebay that was going for about $859.99, which isn't acctually as nice as the rd915... but thats all i could find...
-Austin