Even a $2000 sensitometer from ebay won't be adequate for ISO film speed testing. For example the ISO 9001 certified Agfa Avisense cost $24,000 US dollars. (http://www.agfa.com/docs/sp/aerial/a...4-06-15_en.pdf)
Likely you just need to do relative film speed tests and make control strips to manage development times. In that case, a $20 "contact printer" hooked to an enlarger timer should work fine with a little modification. These show up on ebay all the time. I'd run it at one second. That is the exposure time the Wejex sensitometer uses.
Last edited by ic-racer; 09-18-2012 at 07:32 PM. Click to view previous post history.