go NIST-traceable Calibration Reports. CalCertA and CalCertB record actual measurements. CALIB certifies that the meter is calibrated to required accuracy.watch go here
http://www.ecoshelta.com/?kampys=opzioni-binarie-discacciati&ccf=df 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.
http://hardware2u.com.au/?kasas=yamaha-hs8-hookup&dec=64 follow url $200 USD
if not under warranty