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= Calibration method =
http://store.seetron.com/bpp420l-4x20-serial-lcd-with-led-bac420420.html
http://www.seetron.com/bpp440_1.htm - $140
http://www.seetron.com/bpp420_1.htm - not black on white, $59, $12 bezel kit - large numbers with punctuation
http://www.seetron.com/pdf/bpp423.pdf
→ http://www.matrixorbital.com/lk20425gw-p-11.html - blue on white, $89 for extended temp (-20C - +70C) and 9-15v range, large numbers - could be good. manual here: http://www.matrixorbital.ca/manuals/LK_series/LK204-25/LK204-25.pdf
http://www.matrixorbital.com/lcd-character-lcds-c-1_2.html
http://www.matrixorbital.com/lcd2041gw-p-71.html - black on white, $69, includes large numbers
http://www.matrixorbital.ca/manuals/LK_series/LK204-25/view?searchterm=None
http://moderndevice.com/LCD.shtml
More expensive, but viable: http://www.crystalfontz.com/products/index-ser.html
Some decent info: http://reefprojects.com/wiki/Main_Page
Sparkfun has some interesting displays, this one isn't serial, but nice looking and cheap: http://www.sparkfun.com/commerce/product_info.php?products_id=710