This Unit is designed to verify whether a tester is operating within specifications. This product can be used as one of the tools to fulfill the ANSI/ESD S20.20 paragraph 184.108.40.206 “Compliance Verification Plan.” The 770033Calibration Unit is a passive device and requires no power source. The Calibration Unit is manufactured with industry accepted test ranges for both wrist straps and foot grounders. The wrist strap pass range is set at 750K – 10M, while the foot ground test range is set at 750K – 100M. The SCS Calibration Unit is calibrated to NIST traceable standards.