NF-827 is a socket line sequence detection and digital circuit breaker finder; This instrument is suitable for home, factory and all kinds of large construction sites, it is composed of socket tester and receiver. Features: Accurate Circuit Breaker Identification: Use the circuit breaker finder to quickly and accurately find the correct break location, ensuring efficient electrical troubleshooting. Socket Tester: Plug in the strong power 90~120V power socket, you can see three red indicator lights, different order lights on, judge the fire line, zero line, ground line sequence is correct or wrong. Wide Range Compatibility: It operates on 90~120V AC circuits and is suitable for a variety of electrical systems and installations. Built-in GFCI Tester: The transmitter includes a GFCI socket tester that enables you to check wiring conditions and test GFCl devices for improved safety. 2 in 1 is More Convenient: The transmitter is docked in the receiver, holding the components together when not in use. NCV Induction Pen: One-click identification of live equipment, can detect wires, sockets and so on to avoid the danger caused by strong electricity in the construction process. High Brightness LED Lighting: Built-in electroplating condenser reflector, easy to adapt to the dark environment. Specifications: Model: NF-827 Material: ABS Air Switch Detection Range: 0~3cm Test Voltage of Socket Line Sequence: CAT II 90~120V, 50/60Hz, 5W NCV Electiric Pen: AC90V~1000V, 50/60Hz Power Supply Mode: GP 1604G 9V Low Current Indication: If the battery is lower than 7.3V, the probe indicator will flash Low Power Shutdown: If the battery is lower than 6.8V, the instrument will automatically shut down Maximum Operating Current: ≤50mA Standby Current: ≤30mA LED Lighting: Yes Receiver Power Supply: 9V 6F22 (Not included) Operating Ambirnt Temperature: -20~50 Receiver Size: 49 * 34 * 202mm / 1.93 * 1.34 * 7.95in Socket Tester Size: 56 * 32 * 99mm / 2.20 * 1.26 * 3.89in Package Weight: 550g / 19.40oz Package Size: 25 * 17.5 * 6.5cm / 9.84 * 6.89 * 2.56in Package List: 1 * Receiver 1 * Socket Tester 1 * Cloth Bag 1 * User Manual (English)