Ummm ok. Lots of screaming about safety - all true.
However, you do not need an "ohm checker", better known as a resistance meter. Your Vamo has a resistance meter built in, which is far more accurate than the little black box things, which I have personally have seen have an error of up to 0.2! Hold down the right button for a few seconds and the resistance will show on the screen. With a Vamo v5 it simply will not fire if you have a short or a coil of too low resistance. For the purpose of building protank
coils, the Vamo is a perfectly fine meter to use, if you get into serious sub ohm building, you may consider getting a high quality meter.
In a protank I wouldn't recommend such a small internal diameter, but each to their own. A 1mm internal diameter needs, as someone else said, a 7/6 wrap to achieve 1.8 ohms with 32 gauge wire when wrapped as a micro coil (contact coil). The lower the gauge of the wire, the thicker it is, and the lower the resistance. Keep in mind when buying wire that this relationship is not linear, by which I mean that the resistance does not change by the same amount each time you step down the gauge.
Example:
28 gauge - 0.44 ohms/inch
30 gauge - 0.70 ohms/inch - (0.26 difference from 28 gauge)
32 gauge - 1.09 ohms/inch - (0.39 difference from 30 gauge)
So as you go down in gauge the resistance of your wire decreases at an decreasing rate.
My personal prefered build for the protank at the moment is:
3/64th drill bit
8/7 wrap contact coil
30 gauge wire
1 strand of peaches n cream ekru cotton yarn
through the center (sold at walmart for $1.50)