The Coil Master 521 Tab is builder’s dream tool! The multi-functional designed Coil Master 521 Tab is for both starters and advanced users. The Coil Master 521 Tab offers an ohm meter, voltage meter, rebuilding deck and coil burning features. With a wide array of features, the Coil Master 521 Tab provides everything needed for safe building. Housing a single 18650 high-drain battery (not included) and a Micro USB charging port, you will not need to worry about waiting for a full charge. The big bright OLED screen, displays all the necessary information you need, while building your next project. Forget about spending hundreds of dollars, the Coil Master 521 Tab is an affordable building kit with tons of key features.