REOS MINI 14500 OWNERS:
Haka Meter. 3 modes, Voltage/Ohms/Watts 14mm, 510/Ego.
This looks like an interesting tool for manual mods, since other then device and vapor feedback, knowing when your battery is running low, is IMPORTANT, as you don't want to run them down too low. That number is remaining battery VOLTAGE. Under load (when firing your atty), is perhaps the best indicator, and while sitting NO load, is also a decent indicator, but will show a slightly higher voltage. Doing this with a multi-meter is inconvenient at best. I thought this device might be quick and easy, just screw it on top of your mod's 510 connection. I'm mostly interested in getting a quick idea voltage wise how much battery life I have left before swapping out batteries. The lowest voltage you should swap batteries out is sometimes debated, many battery specs say lowest is 2.5 volts, most don't like to let their batteries get below 3.0 volts, and most notice their vapor diminish after getting lower then approx. 3.5 - 3.6. This might be a good quick way to know whenever you are curious or in doubt.
I've seen clear and colored versions of 510 battery voltage readers (Eleaf etc.), most ONLY read voltage, cost approx. $15, and come in a 22mm size, these may be fine for most mods, but NOT on the tiny Reo Mini 14500 (would certainly hit button cover).
What separates this brand, is it's 14mm diameter, and should fit fine on a 14500 Mini, and has the three measurements, voltage, ohms, wattage. Double checking ohms while using isn't a bad thing either, as atty post screws do loosen themselves up at times too.
I just bought two of these in black. They make a silver version too. I've seen them as cheap as $10/each. Some sites list the ohms range as "unlimited", this site shows down to a .7 ohm limit. Not many reviews, but from the little I could find, it is not ideal for low ohm vapors, and did not work on really low ohm builds. Not an issue for me, and the wattage and voltage ranges would still be fine. Some of you may have seen this, just sharing it for those who have not.
Haka Meter Voltage/Ohms/Watts Tester - Black