LCD DISPLAY: The socket finder has an LCD screen with backlight, display voltage and frequency, can bring you more convenience. EASY USE: Smart circuit tester can plug and play, no battery required. Safety of the detection circuit to one key, very practical at work and in life. ANTI-SLIP: The polarity voltage detector The electrical circuit is easy to repair. use, overall non-slip design, comfortable hand feeling, can bring you a better experience. LIGHTWEIGHT: The circuit breaker finder is compact in size, lightweight and practical, easy à transport and transport tidy up, can improve efficiency. work, save time and energy. WIDE APPLICATION: The portable receptacle tester has a wide usage range, widely used in many industries. in schools, laboratories, factories and other fields.