A current perpendicular to plane giant magnetoresistive sensor having an antiparallel coupled free layer including a first magnetic layer of Fe and a second magnetic layer of FeXN, where X can be Al or Ta. The filler member includes: a fitting member, a connecting member mounted on the bodies. The sprayer assembly includes nozzles which administer herbicides or other chemical treatments adjacent to the saw blades, allowing herbicide to be precisely administered to the tree limbs as they are cut. The baseplate lies in sufficient proximity to the Hall-effect device to cause the same to develop a voltage indicative of the current magnitude on the current path. Such customer information may, for example, include credit card account information andor bank account information.