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Tektronix
Tektronix is one of the founding names in oscilloscopes, and the range here reflects that: digital oscilloscopes, active and differential probes, current probes, passive probes and benchtop spectrum analyzers.
Probe selection is where Tektronix purchases most often go wrong, because the probe and the scope form one measurement system and the lower bandwidth governs. A 200 MHz scope fitted with a 100 MHz probe is a 100 MHz instrument. Probe interfaces are also largely specific to Tektronix and do not interchange with other makes. Tell us the scope model you own and the fastest edge you need to resolve.
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The Tektronix RSA603A USB Real-Time Spectrum Analyzer delivers 40 MHz real-time bandwidth and 9 kHz to 3 GHz frequency coverage, ideal for RF, microwave, and wireless signal analysis. With high dynamic range and USB connectivity, it offers portable, high-performance measurement for lab and field use.
Tektronix LPD64/6-BW-2500 four-channel low-profile digitizer with 2.5 GHz bandwidth, 25 GS/s sampling, and 12-bit resolution for high-speed signal analysis.