Lake Shore Cryotronics Inc., in collaboration with Toyo Corp., has introduced the 8400 series, a Hall effect measurement system with optional AC field measurement capability. Hall mobilities down to 0.001 cm2/V can be measured, lower than is possible using traditional DC field Hall measurement techniques. An emerging class of photovoltaic, thermoelectric and organic electronic materials is characterized by low mobilities that are difficult to measure. The DC field Hall measurement technique has been sufficient to measure materials with mobilities down to ~1 cm2/V, but it is challenging to extract the diminishingly small Hall voltage from the background noise produced by such materials. The Model 8404 Hall system provides a robust platform to which new features can be added as material measurement needs evolve.