Coil Master 521 tab insures you not building a dangerous coils for the mod you are using.

Features
Ohm meter
Voltage meter for Mec. MOD/Regulated MOD
Coil rebuilding deck
Coil burning
Table MOD
Reverse battery protection

Specifications
Resistance Measuring Range: 0.01 – 9.99 ohm
Voltage Measuring Range: 0.3 – 9.99 Volt
Resistance rate: As low to 0.2 ohm
Connection : 510 threaded with spring loaded pin
Charging: 4.5V/ 750mah Micro-USB Charging input
Battery: Lithium 18650, 3.7V (Batteries are not included in the product)

General specifications
Dimension : 49.5mm x 84.5mm x 69.5mm
Weight : 190g
Housing material: ABS

Function Selector :
I – Turn on Resistance and Voltage meter, Flashing ring light
O – Power Off
II – Burning mode, lamp on