MULTIFUNCTION:This ammeter accurately measures alternating current (DO NOT MEASURE DIRECT CURRENT)! AC/DC voltage, capacitance, resistance, diode continuity and line phase. Very useful tool and Tester for troubleshooting industrial and household electrical problems. LARGE OPENING: The large opening of the clamp meter measures AC current in a conductor without touching or interrupting the circuit. Its slim and compact size makes it easy to use in tight spaces. LARGE APERTURE: The clamp meter's large aperture measures AC current in a conductor without touching or breaking the circuit. Its slim and compact size makes it easy to use in tight spaces. Easy to Use: Supports data hold, Max/Min, auto power off, low battery indicator and timer. continuity buzzer. Convenient features such as audible and visual alarm, backlit LCD display and flashlight make your operation easy. Two 1.5V AAA batteries are included in the package. EXTRA SAFETY: The Non-Contact Voltage Tester (NCV) allows non-contact testing with sound and light alarm. When the multimeter detects a weak AC signal, the green LED illuminates and the buzzer emits a slow, audible beep. When the multimeter detects a strong AC signal, the red light will illuminate and the buzzer will beep rapidly. ADDITIONAL TIPS: This has passed environmental pollution degree 2 and overvoltage category safety standards III 600V. Combined with Amazon's excellent delivery, we provide lifetime technical support.