Tektronix FCA3100 Frequency Counter, 0.001 Hz Min, 300MHz Max, 12 Digit Resolution
6ns, Attenuation: 1:10, Maximum Input Voltage: 5 V, 50 V, Minimum Input Voltage: -50 V, -5 V, Input Impedance: 1 MΩ, 50 Ω, Measurement Time: 250ksps, Connector Type: BNC, SMA, Type-N Female, Dimensions: 395 x 210 x 90mm, Length: 395mm, Maximum Operating Temperature: +50°C.001 Hz Min, 300MHz Max, 12 Digit Resolution, Pulse Width Resolution: 1.