S2772 Workstation Monitoring System The S2772 is a Constant Monitoring system for a Two-Operator/Station. The System is an Impedance-Base Monitor which is designed to work with Dual Conductor Wrist Straps. NIST Certified. Product Information Related S2221 Wrist Strap Monitoring System for Single Operator S2222 Wrist Strap Monitoring System for 2-Operator S2771 Workstation Monitoring System S2555 Single-Wrist Strap & Mat Ground Monitoring System SM2 Resistive-Base Dual Workstation Monitoring System