Small size, cordless, portable operation for use in any work area. Simple and Responsive Push Button Wrist Strap Tester. Wrist strap not included. Use any standard ground wrist strap or wire with bananna plug male end. Provides clear audible and visible fail/pass indications Quickly and easily check ground systems at any place Fabricated in a durable, ESD-safe plastic housing. Equipped with a 9V lithium battery. Wrist strap tester verifies that resistance of your wrist strap is no lower than 800KΩ and no greater than 11MΩ.The proper resistance will provide an "OK" GREEN LED indication on the wrist strap tester. If either the RED "FAIL LOW" or YELLOW "FAIL HIGH" LED's light, and the audible indicator sounds, then the wrist strap (or the ground cord) should be replaced. The static strap function, Wrist Strap Tester can quickly and easily check the following: Test static strap and ground wire connection Test the impedance between skin and Static strap Test the connection during anti-static access panels, cushion for connecting ground Quickly and easily check ground systems at any place Avoid static electricity discharge damage to product Ensure staff safety LO (red): R<800K ohm Buzzer Indicator: ON OK (green): R = 800KΩ ≈ 11MΩ Buzzer Indicator: OFF HI (yellow): R>11M ohm Buzzer Indicator: ON Dimensions: 80(W)x40(H)x117(D)mm Power source: 9V battery LED and Audio Results Quickly check grounding straps with push of button. Connect grounding cable end to wrist strap tester and press the test button. Results will be indicated with Visual LED and Audio beep. ESD Safe and Portable Design Smooth edges around, ESD safe, essential for your electronic and welding workstations. Used for factory calibrated and quality control checked. Outside size: 80(W)x40(H)x117(D)mm; Weight:145g.