The Sonel P-4 bipolar voltage indicator is a reliable, extremely durable and safe bipolar tester, which allows to check voltage, continuity of circuit and phase sequence. It is designed to operate in the harshest environments, both industrial and commercial. Advanced technology, high level security and ease of use are the key features of the P-4. The device is equipped with a robust IP65 casing, which protects the device from mechanical damage, dust and splashing. Main functions and attributes of the P-4 instrument. Automatic voltage test up to 1000 V AC/DC Optical indication by a LED bar Sound indication when dangerous voltage levels of 50 V AC and 120 V DC are exceeded RCD trip test with switchable load Automatic continuity test upon connection to the object 2-pole test of phase rotation direction Single-pole indication of 100 V presence HOLD function for freezing the measurement results Robust, two-component housing protecting from mechanical damages and impacts IP65 ingress protection guarantees protection against dust and water Safety provided by measuring class compliant with CAT IV 600 V and CAT III 1000 V standards