Brush probe 4 mm. For gentle contacting of touchable conductive parts, such as sensitive metal surfaces and rotating/vibrating parts such as drill chucks, orbital sanders, etc. Supports testing of protective conductor, insulation resistance, contact current, output voltage measurement of welding devices, etc. Plug-in technology 4 mm safety plug technology for holding the test probe of the device tester. Color: black. Total length: 185 mm, brush length 60 mm, brush diameter: 20 mm. Brush material: brass, weight: 35 g. Material of the insulation material: other. Supplied in a practical PVC storage box.