It might be hard to check your purchase order, but there’s a chance it’s on record somewhere. Typically the power factor won’t be on a purchase order, but should be on a test report. Either one from the manufacturer or one from acceptance testing by a certified electrical testing company. The power factor test measures the dryness of the transformer’s insulation. Although 1% is the legal limit for transformers, most transformers are at or near that level, indicating a lower quality transformer – meaning it has a shorter life and less-efficient performance. ELSCO dry-type transformers are consistently at or below .1 because of their high-quality manufacturing. The lower your score, the greater the safety, longevity and performance.