The Smoktech 510 DCT V2 is a new version of the DCT. It is the same structure as the Smoktech 510 DCT. However, they are different in size. The Smoktech 510 DCT V2 is smaller than the 510 DCT. The 510 DCT V2 holds 3.5ml of e-liquid and the 510 DCT holds 6ml of e-liquid. The cartos in this tank are listed as 1.5 ohm +/-0.2 ohms.