Pico TA066 is a basic accessory kit for 2.5 mm passive probes. The TA066 kit contains:15cm ground lead, 0.5mm Solid tip CuBe, 0.5mm spring tip gold plated, 2.5mm sprung hook. Compatible probes are: TA061 ( 898-6832 ) 1.5 GHz low-impedance probe with SMA,