Magnetic Field Detectors for Research -- 2

I need 40 sensitive magnetic field detectors for scientific research. The sensors I needed were created by Professor Gang Xiao at Brown University in Rhode Island, USA. He created the worlds most sensitive magnetic field detectors and the cheapest. Without these sensors I cannot approve of the project. All 40 sensors must be connected with a 2 inch field and be able to plug into a wall socket OR a rechargeable battery pack.

Requirements:
- Measure as low as possible magnetic fields
- Fixed/stationary form factor

Ideal Skills & Experience:
- Electronics design and assembly
- Experience with magnetic field sensors
- Ability to produce in bulk