I'm so forgetul of meters that a long, long time ago I bought enough meters to permanently keep one in each camera bag. What is your defintion of "cheap"? There is a Gossen LunaPro in the ads for around $80 with a 7.5/15 deg. attachment. That is what I keep in my MF bag and find it to be very useful in a "cheap" way. I've never been let down by it. Since the old merc battery is needed I fitted mine with an adapter, but cheaper option is also available.