- Trusted Seller Stanford Research Systems / SRS SR650- Manufacturer: Stanford Research
- Model: SR650
 Stanford Research (SRS) SR 650 High Pass / Low Pass Dual Channel Filter - can be cascaded for bandpass. Cary, NC
 - Stanford Research SR650- Manufacturer: Stanford Research
- Model: SR650
 - 100kHz One High Pass ch, One Low Pass ch Filter, w/GPIB, RS323 $2,515 USDFarmingdale, NJ

