Check your custom coil builds with this Infinite Digital Ohm Meter. Connection points fit 510 and eGo threads. Save yourself the hassle of finding out too late if your coil build is working or not. Also great to test ready made tanks and coils to ensure you've received the correct item. Ohm range from 0.00 - 9.99 ohms. Accurate to hundredths of ohm (n.nn ohm), it is superior compared to readers that only read up to tenths of an ohm (n.n ohms). Simple push button on/off switch with a digital LED display. This Infinite Ohm Tester has internal batteries and is rechargeable with a common micro-usb charger (not included). A charging LED indicates full charge. The case body is metal for superior durability and has a sleek finish. Internal rechargeable batteries - charging cord not included!