Makerbot Replicator 2 Bed Leveler for dial indicator.

Yet another bed leveling device. Based on this thing:
http://www.thingiverse.com/thing:267919

I used this dial indicator:
http://www.amazon.com/gp/product/B000NPPBVK/ref=oh_details_o02_s00_i00?ie=UTF8&psc=1

And 4 of these magnets, held in with some tape.
http://www.amazon.com/gp/product/B001KUWM3C/ref=oh_details_o00_s00_i00?ie=UTF8&psc=1