The magnetic field strength of a methane dwarf measured from its radio spectral cutoff

̊m GHz , implying field strengths far higher than canonical expectations from dynamo scaling laws. However, it is also possible that these high-frequency emissions did not originate in the large-scale magnetic field but rather from small high-field-strength loops at the surface, which the scaling laws are not designed to predict. Here we present radio observations of a methane dwarf binary (WISEP J101905.63+652954.2), whose radio emission was first detected in an untargeted low-frequency survey. This makes it more likely that the emission traces the object's large-scale magnetic field. The object's spectrum shows a clear radio spectral cutoff whose location yields a polar surface field strength of around 126 gauss. Canonical dynamo scaling laws based on energy balance overestimate the field strength for this object, but the scaling law based on Lorentz-Coriolis force balance (Elsasser number rule) is consistent with the measurement. Our results suggest that multi-frequency (megahertz to gigahertz) monitoring of brown-dwarf electron cyclotron maser emission is essential for separately measuring the `mean field' on large scales and `fluctuating' fields on smaller spatial scales, in order to determine the dynamo scaling law that most accurately predicts field generation in the metallic hydrogen layer of gas giants and cold brown dwarfs.