A lightweight, transportable, and inexpensive magnetic susceptibility track for u channel samples is described. The track utilizes a Sapphire Instruments 3.3 cm square coil having a response function of shape similar to that of the 2G-Enterprises u channel magnetometer, and a half-peak width of 3 cm. The instrument has been calibrated using a u channel standard made of manganese dioxide. The software incorporates automated track control and measurement drift correction. Susceptibility measurements on this system compare favorably with the 45 mm circular Bartington loop used for u channel samples at the Laboratoire des Sciences du Climat et de l'Environnement (Gif-sur-Yvette, France) and with data from the whole core susceptibility track aboard the Ocean Drilling Program research vessel JOIDES Resolution.