I'm looking to buy a Macbeth Densitometer. (TD504 would be great.) If any of you are looking to sell one, please let me know. I've searched on Ebay and Craigslist, but I'm not generally convinced that they are still working...usually it seems that they are being sold for parts. I would only be interested in densitometers in working condition. I'm using it for B&W so other filters are not part of my consideration.