• On/Off Switch on the front panel
• When powered up & at the On position, Constantly Monitors the Wrist Strap for Skin Contact, 1 Meg Resistor, & Ground Connection
• LED Indicator on the front panel
• Wrist Strap Receptacle on the front panel
• 6V DC Receptacle on the back panel
• 2 Recessed holes for Mounting Screws
• Ground Connection Post on the back panel

The S2221 is a small & precise device for constant monitoring of standard single conductor wrist grounding straps, with audible & visible alarm features. NIST Certified.