Lock-in amplifier from Stanford Research Systems has frequency range of 0.001 Hz to 2 MHz

The SR865 2 MHz lock-in amplifier has a frequency range of 0.001 Hz to 2 MHz, dynamic reserve >120 dB, stability <5 ppm/°C, and phase resolution of 0.1 μDeg. A touchscreen display shows results in large numbers as well as chart recordings for a complete time history of data.Stanford Research Systems
Sunnyvale, CAwww.thinksrs.com