The Amprobe NCV1040 Non-Contact Voltage (NCV) tester provides maximum safety and convenience for detecting AC voltage without interrupting electrical systems. Designed to conveniently fit in your shirt pocket, the NCV-1040 tester performs in indoor and outdoor settings. Safety tested to the highest category measurement, CAT IV 1000 V, as well as IP65 water and dust resistant, the NCV-1040 is fit for the toughest industrial applications.