- Trusted Seller Stanford Research SR556- Manufacturer: Stanford Research
 Lock-In Current Preamplifier, 3 kHz (-3 dB) Key Features & Specifications Stanford Research Systems - SR556 Lock-In Current Preamplifier, 3 kHz (-3 dB) 1 V/nA fixed gain 5 fA/ˆšHz input noise Bias voltage input... Cary, NC

