good or bad soupwire emblem

“What’s that build ohm out at?” It sounds like an odd question to non-vapers, and yet is common in the community. An ohm reader could be the most important tool for any vaper, from beginners to advanced. Today, we’ll discuss why it’s an essential piece of your vaping toolkit.

Why is an ohm reader so important? Ohms are a key piece of the ‘Ohm’s Law’ puzzle.

Ohms Law states that the current through a conductor between two points is directly proportional to the voltage across the two points.

An ohm is defined as: an electrical resistance between two points of a conductor.

Every coil/coil head used in the vape community has a resistance reading. Different build = different reading.

For example: five wraps of 26g A1 kanthal, around a 3mm drill bit = .45ohms

12 wraps of 22g A1 kanthal, around a 3mm drill bit = .45ohms

The Resistance Readings Are The Same, BUT…

You’re probably asking yourself why having an ohm reader matters at all. Well for starters, even though the resistance readings on the above single coil builds are identical, the power requirements are vastly different. The coil made with 22g kanthal (12 wraps, 3mm ID) requires almost twice the voltage (4.3) when vaped at 41watts compared to 2.1V at 10watts for the small coil.

Your Mod May Be Lying To You

Box Mods and other personal vaporizers have came a long way. Unfortunately, they cannot be fully trusted when it comes to reading the resistance on a build. Instead, an ohm reader must be used to provide an accurate reading. Sometimes the reading on a mod can be .20ohms off or more. This variance tends to fluctuate with between devices. In general, the more expensive mods provide more accurate readings, and cheaper devices are less reliable in this regard. So having one device specifically designed to measure resistance can be worth its weight in gold.

It’s All About Battery Safety

All batteries used to vape have a rating, and normally included MAH (milli-amp hours) and a amp or base unit of electrical current. Vaping a build that exceeds the constant discharge rating (CDR) of the battery you’re using can spell disaster, and should be avoided at all costs. Most novice-advance vapers build within a specific resistance range to avoid pushing the limits of the CDR rating on their batteries. Working within the ‘safe zone’ of your batteries will ensure that you never stress your cells, and will keep you safe while vaping.

The Bottom Line

This can be a confusing topic for some, but trust me when I say, it doesn’t have to be! Understanding Ohm’s Law, or at least having a basic understanding of it, is always a good idea. I always suggest new vapers take time out of their day to read the basic electrical law, so they can feel as comfortable as possible when vaping. I encourage anyone who may be uncomfortable with the matter to ask a member of the community.

Some non-adjustable pen style devices vape within the confines of a controlled environment, that has already been tested and proven safe for use. If you’re vaping with an adjustable wattage device, I HIGHLY recommend purchasing an ohm reader. Having an accurate resistance reading is crucial.

Purchase an Ohm reader here

Like what you just read? Consider clicking one of the affiliate links in this post or using the Vape Deals page on the site to make your next purchase. You get the chance to buy products (at a discount) from great companies, and we get a small commission when you use these links — which helps keep the lights on and pay for more great content. It’s a win-win!