There is technically 2. The original release had a spinning 510 connection that caused a lot of trouble with the
device correctly reading coil resistance which affected it firing correctly in wattage mode. The New version has a fixed 510 connection to address the problem. Some places will list it in the description that it's the new version.
I returned the original one I bought due to that issue and just recently bought a new one off eBay from an authorized seller that's a shop in California. I love the device and was really glad to see they addressed the issue. I would recommend just reading the description looking for the new version.
I've read it's a mixed bag from
fasttech with some recent orders receiving both versions that's why I searched specifically for the new one. The shop I bought from on eBay was same price as
fasttech and only took 2 days to get to me instead of 2 months. Hope that helps.
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