By the popular mod manufacturer Sigelei - the Sigelei 30 Watt with gravity sensing is a powerful 30 watt regulated mechanical mod that is capable of low resistances (but not quite sub-ohm resistances).
This is an attractive stainless steel mod with standard 22 mm width so most 22 mm tanks will fit flush on top of it. It has regulated output up to 30 watts in 0.1 watt increments which you can change simply by tilting the mod to either side. It will function with coil resistances of 1.0 ohms and above, and it takes 1 x 18650 battery so you will simply have a very long lasting battery with any standard resistance tank.
The SX300 chip allows excellent power output and consistent vapor, and also enables the user to use gravity to switch the different settings on your mod. All in all it is super slick, well built, and will give a great vape especially combined with something like the Nautilus or the Ego One Mega with 1.0 ohm coils.