The image shows a round knob with a glass surface and grooved design. The bottom is black, and a USB cable leads from it. The knob is likely used for volume control.

This product is compatible with (for example):

Image
PGT 120 personnel grounding tester for
access control, ++special version++
incl. power supply unit and footwear electrode
Footwear electrode
++ Special version with an RS232 interface to connect e.g. to time recording terminals, test results are provided via RS232 interface ++

1,002.95 CHF

This product is similar to:

Image
PGT 120 personnel grounding tester for
access control, ++special version++
incl. power supply unit and footwear electrode
Footwear electrode
++ Special version with an RS232 interface to connect e.g. to time recording terminals, test results are provided via RS232 interface ++

1,002.95 CHF