I'm using both Elos and Salifert right now. The Salifert one is nice in that if you look through the vial sideways instead of top-down, the reading is ten times what it is from the top, so if it reads out at 20 through the side then you know it's 2.0 and I find this easier than trying to colour match the subtle clear shades of the lower range numbers.
The probe is definitely the nicest way to take a reading but yeah, unfortunately a bit spendy. I believe Hanna Instruments also has a nitrate photometer, although if the phosphate meter is any indication it won't be any cheaper than the probe (at least not significantly).
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-- Tony
My next hobby will be flooding my basement while repeatedly banging my head against a brick wall and tearing up $100 bills. Whee!
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