7280 – Signal Recovery Lock-in Amplifiers
2.00MHz (High end frequency limit)

7280BFP – Signal Recovery Lock-in Amplifiers
2.00MHz (High end frequency limit)

7265 – Signal Recovery Lock-in Amplifiers
250.00kHz (High end frequency limit)

SR844 – Stanford Research Systems Lock-in Amplifiers
200.00kHz (High end frequency limit)

5209 – Signal Recovery Lock-in Amplifiers
120.00kHz (High end frequency limit)