Features:· Durable RF probe · Any pitch from 50 to 2540 microns · DC to 40 GHz · Insertion loss less than 0.8 db · Return loss greater than 18 db · Measurement repeatability better than -80db · Individually spring loaded contacts · BeCu , Tungsten or Nickel tips available · Variety of footprints · Patented coaxial design · Available in thirteen styles· Custom configurations available