source NIST-traceable calibration report recording actual measurements of V, A, and W prior to calibration. A great benefit if there is any question about the accuracy of results of a power study that is already done.
http://ecapguatemala.org.gt/poioe/5911 NIST-traceable Calibration Reports. Note: CALIB is provided at no charge with each purchased PowerSight analyzer and then once a year at no charge while the meter is under warranty. CalCertA and CalCertB always are an additional cost.