This tangent galvanometer is constructed of neutral acrylic with a coil containing @800 turns of insulated copper wire. The coil is intersected with an acrylic platform designed to hold the (included) liquid filled magnetic compass. The compass is positioned so that it's pointer runs parallel with the coil. When a voltage of 3-6 V is applied to the coil, the compass will deflect so that it is positioned perpendicular to the coil, depending upon voltage and current.
Input Voltage: 3-6V DC
4" x 3" x 5" (lxwxh)