This unit does not require ground wire or clip and is safe with ECMs, Sensors, Transducers, Airbags, etc.
• Designed to be used on DC powered circuits with voltages between 3 and 28 volts
• Special designed V-Tip needle allows safe piercing and prevents side-slipping when piercing wire's insulation. V-Tip can be removed to test hard to reach places
• Unit works with replaceable long-life alkaline batteries
• Made of rugged chrome metal