The introduction of a precision, inductive, decade ratio transformer to serve as a voltage divider together with voltage followers permits one to construct a 4‐terminal ac bridge with an accuracy of better than 0.001%. Such a bridge is particularly suitable for accurate (0.003%) low‐temperature Ge resistance thermometry. This bridge also makes possible the direct intercomparison of different Ge resistance thermometers, thus allowing a direct and therefore more accurate determination of temperature gradients.