Moisture Resistance of cell phone jammer

Semiconductor transistor has three modes of operation, amplification, saturation, cut-off, generally used in analog circuits amplification. General state of saturation and cut-off combined in a digital circuit. Multimeter black pen with a certain fixed transistor electrode, then the red pen are the other two electrodes with the semiconductor transistor, observe the pointer deflection, if the resistance of the two measurements are both large or small, you change the pin is received by the base (two times the resistance for the NPN type are small tubes, are the two major resistance for the PNP-tube), if the two measurements and a small resistance, then use black ink to re-semiconductor transistor a fixed pole to pin measurement, until you find the base.  cell phone jammer has successfully taken the scientific experiment.
After determining the base for the NPN transistor with a multimeter to the other two tables document connected bipolar transistor, alternately measure twice, if not equal the results of two measurements, the measured resistance of which was a small black pen then is e very, then get very red pen is c (PNP-tube if you have black and red table document received the opposite electrode). If you know of a semiconductor transistor base, you can use the red pen then base, the black pen to measure the other two electrodes, respectively, pins, if the measured resistance value is large, the transistor is NPN type semiconductor transistor, if measured resistance value is very small, the transistor is a PNP-type semiconductor transistor is now common transistor are mostly plastic, and how to accurately determine the transistor's three pins which are b, c, e? Transistor is easy to measure the b pole out, but how to determine which is c which is e?