- 4505 NF Corporation RF AmplifierCondition: NewPower: 500 WFrequency: 20 kHz
- 5610B NF Corporation Lock In AmplifierCondition: NewFrequency: 200 kHz
- 4502 NF Corporation RF AmplifierCondition: NewPower: 250 WFrequency: 20 kHz
- 4510 NF Corporation RF AmplifierCondition: NewPower: 1 kWFrequency: 20 kHz