The Instek GTP150B4 150MHz Oscilloscope Probe for Models GDS-1152A-U, GDS-2102A, and GDS-2104A is a passive high impedence oscilloscope probe designed and calibrated for use on an instrument with an input impedance of 1MΩ shunted by 20pF. This model may be compensated for use with instruments with an input capacitance of 5-30pF. The probe incorporate a two-position slide switch in the head which selects attenuation of x1, x10 position.