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- SR830 Stanford Research Lock In AmplifierCondition: UsedFrequency: 102 kHz
- SR530 Stanford Research Lock In AmplifierCondition: UsedFrequency: 100 kHz
- SR510 Stanford Research Lock In AmplifierCondition: UsedFrequency: 100 kHz
- SR850 Stanford Research Lock In AmplifierCondition: UsedFrequency: 102 kHz