Tektronix thp0301 series passive 10x voltage probe tektronix thp0301 y the tektronix thp0301 y is a passive 10x voltage probe from the thp0301 series this yellow 300mhz probe is for use with the ths3000 series oscilloscopes and is colour coded to match the oscilloscopes channel input connectors front panel channel selector buttons and the displayed waveformsthe thp0301 y probe has a cat iii safety rating which matches the safety rating on the ths3000 series oscilloscopes enabling you to