The Tektronix P6245 a fast active probe with a bandwidth of 1.5 GHz and a verly low input capacitance <1pF.

• =1.5 GHz Bandwidth (Typical, Probe Only)
  
• =1 pF Input Capacitance
  
• 1 MO Input Resistance
  
• Direct Access to SMDs as Small as 0.5 mm Pitch
  
• Measures CMOS, BiCMOS, ECL, GaAs and TTL Logic
  
• High-speed Digital Systems Design
  
• Component Design/Characterization
  
• Manufacturing Engineering and Test
  
• Educational Research