Tektronix p6139b 500mhz oscilloscope probe tektronix p6139b p the tektronix p6139b is a 500mhz oscilloscope probe this high bandwidth high impedance probe features a small probe head and sharp tip that makes it easier to probe dense circuitry p p applications low power devices service manufacturing engineering test research and development p tektronix p6139b oscilloscope probe 500 mhz 10 1 300v