The glass transition and melting behavior of a thermoplastic polymer depends on the degree of crystallinity, the crystalline perfection and other factors [36-41]. Knowledge of this behavior is valuable for processing and the use of the polymer. This behavior is most commonly studied by DSC [36-41], although the DSC technique is limited to small samples and the associated equipment is expensive and not portable. As the degree of crystallinity and the crystalline perfection of a polymer de-pend on the prior processing of the polymer and the effect of a process on the micro-structure depends on the size and geometry of the polymer specimen, it is desirable to test the actual piece (instead of a small sample) for the glass transition and melting behavior. The measurement of electrical resistance provides a technique for this purpose.