The latest innovative accessories from Coil Master introduced at the 2015 ECC in Pomona, the 521 Tab. This multi-functional device acts as an ohm meter reader, voltage drop checker, rebuild deck, test fire station, and you can even vape with it! It is equipped with a 510 spring-loaded connector for attys of all size, 2 hole connectors for the included Voltage Checker and Terminal Connectors, 2-way rocker switch, and intuitive OLED screen with pipe symbol for test-fire setting and measurement readouts. While your RDA is attached and juiced up with today’s top e-liquids, you can read the current ohm status and test fire it or attach the Voltage Checker and screw your mech mod for voltage gauge. Overall, this is a game-changer, one of the most fascinating device engineered for advanced vapers and DIY cloud chasing enthusiasts.