The Desco 19668 Zero Volt Monitor is a dual workstation continuous monitor. The Desco 19668 continuously monitors the path-to-ground integrity of two operators and two ESD worksurfaces. The Desco 19668 also will indicate if voltage greater than ±1.25 V is induced onto the operator. The Desco 19668's audio and visual alarms activate in failure situations. The Desco 19668 provides stable continuous monitoring of the path-to-ground and presence of two 1 megohm resistors of an operator's dual-wire wrist strap. The Desco 19668's audio and visual alarms activate (in less than 500 milliseconds) when the wrist strap connection points are intermittent. The Desco 19668 also monitors for a worksurface path-to-ground less than 3.5 megohms. The Desco 19668 is calibrated to NIST standards and includes a certificate.