If it is an open circuit, the LED light will not light. Besides, sharp stainless steel probe for piercing wires effortlessly, also for hard to reach tight areas.

Volt: 12V/24V
Country/Region of Manufacture: China
Features 1👍: Bad ground indicator, power injection, measurement, ground tester
Features 2👍: Polarity check, component activation, Circuit breaker protect
Features: AVOmeter, test light, built-in flashlight, Circuit indicator
Features 3👍: Audio tone indicator, VOLTAGE & POLARITY TESTING
Features 4👍: Red/Green Polarity LED, Continuity Testing, Digital Display
Vehicle Type: Passenger Vehicle
Accessories: Carrying Case, Probes, User Guide
Features 5👍: Relay & Component Testing, Voltmeter
Features 6👍: ACTIVATING COMPONENTS IN THE VEHICLE
Display: TFT color display (160 x 128 dpi)
Operating Temperature: 0 to 60°C (32 to 140°F)
External Power: 12.0 or 24.0 V power provided via vehicle battery
Length\Width\Height: 126mm(4.96”)\46.5mm(1.83”)\35mm(1.38”)
Net Weight: 0.105kg (0.23lb),GW: 0.726 kg(1.6lb)
Brand: Autel
Warranty: 10 Year
Model: Autel Powerscan PS100