dergeophysiker

I am thinking of buying a used analytical balance with a sensitivity of around 0.0001g. Something very similar to this --> http://www.coleparmer.com/Product/Cole_Parmer_Symmetry_PA_Analytical_Balance_120g_x_0_0001g_115_VAC/EW-10000-15 . If I buy it used, perhaps 7-8 years old, what potential hardware issues could it have? I am not familiar with this kind of equipment. How fragile is it? TIA