Dependable and accurate dual wire monitor for one person. The RangerOne is an extremely sensitive monitor that accurately measures the electrical resistance of an ESD wrist band and signals if the device fails. The Resistance Ranger Series is the most reliable workstation monitoring system available. The extremely sensitive monitors accurately measure the electrical resistance of an ESD wrist band and work surface and signals if the devices fail. Audible and visible alarms are triggered if the operator's resistance exceeds 35 meg ohm. The Ranger Series saves time by eliminating the time-consuming testing of wrist straps and coil cords.