Peptide Critic Community

I did try priming the syringe but with the exception of using regular water and not Bac water when I am doing these tests. Just sacrificing a cartridge and syringe. I do agree with the V2 being smooth running. I will keep looking at this and will reach out to randy if I just can’t get it figured out. I do appreciate all the responses/info.

I have a Xulin Pen 3 and the other two are V2s.

Real newb here. Trying to get into using pens over syringes. I’ve purchased two from here and one from Amazon for a comparison but while trying to replicate the test I’ve seen here, each one is 2 units short. I’m sure it’s something I am doing since all three are doing the same. Testing using the same type of syringe as the video and for 10 units it works exactly but moving to 20 or 25 it is consistently short by 2. Any suggestions?