The Instek GTP-100B-4 100MHz Oscilloscope BNC(P/M) Probe for GDS/GOS/GRS Series is a passive high impedance oscilloscope probe designed and calibrated for use on instruments having an input impedance of 1MΩ shunted by 20pF. However, it may be compensated for use with instruments having an input capacitance of a 10-35pF. The probe incorporates a two position slide switch in the head which selects attenuation of x1, x10 position.