Thermo Fisher Scientific (TMO) is one of the stocks most watched by Zacks.com visitors lately. So, it might be a good idea to review some of the factors that might affect the near-term performance of the stock. Shares of this maker of scientific instrument and laboratory supplies have returned -2.6% over the past month versus the Zacks S&P 500 composite's +1.6% change. The Zacks Medical - Instruments industry, to which Thermo Fisher belongs, has lost 0.3% over this period. Now the key question is: Where cou ...