SECO-LARM ST-BL01Q Hi-Speed Latching Continuity Tester, Test N.O. and N.C. Circuits, Verify Circuit Continuity Through Beeper or Visual Indication, Built-in LED Light, Three Testing Modes Test N.O. and N.C. circuits Verify circuit continuity through beeper or visual indication Three testing modes (Real-time, Real-time, Latch mode) 100s Sensitivity, Battery included Optional belt clip included for easy transport