The scale should be situated on a flat, level, and stable surface. The scale platform should be securely fastened to the scale sub-platform. The scale can be affected by electrical and RF (Radio Frequency) interference. Operation near power transmission lines is not recommended. Operation near appliances which switch on and off with heavy currents (letter openers, copiers, microwave ovens) is not recommended. The recommended operating temperature for the scale is room temperature (around 77 degrees Fahrenheit ). Allow the scale three hours to adjust to a the new climate if the scale was stored in a location a hot/cold environment. If the scale is to be operated in environments above or below room temperature, it is recommended that the scale be re-calibrated in that environment after a three hour adjustment period.