All of the equipment that is calibrated from ACL Staticide is calibrated to NIST standards as listed on the Certificate of Calibration.
The calibration is good for one year after the purchase date. If an updated certificate is needed, please call ACL Staticide with the Serial Number and Date of the purchase at 1-800-782-8420 ext. 331 or send a calibration request to firstname.lastname@example.org
ACL Staticide recommends that recalibration is done one year from the date the units were placed in service. If the parts are sitting on the shelf, this will NOT make a unit go out of calibration.
Click on the link for ACL products that come with certificates.