None yet, but I have a back-up plus a plastic hydrometer now (which seems to be more accurate as you can nip off pieces of plastic to bring it down to exact calibration). I think having an extra one somehow keeps you from breaking the first one.
"People should not be afraid of their governments. Governments should be afraid of their people." - V
Secondary: Shady Lord RIS, Water to Barleywine, Pumpkin wine, burnt mead
Kegged: Crappy infected mild
Bottles: Apfelwein, 999 Barleywine, Oatmeal Stout, Robust Porter, Robust smoked porter, Simcoe Smash