Peptide Critic Community

I primed and used bac water. I pushed the plunger to the point of a couple of drops of water was coming out. Maybe the vial, but it dispensed perfectly on the V2. Since it is non-returnable, l'm stuck with the V4.

I just bought a V2 and V4 pens. In testing them both, the V2 had almost perfect accuracy. I tested 10, 20, then 40mls each 3 times. I did the same on the V4 and accuracy was short 1.5 -3 on the 10ml testing. This is concerning, because that is 15-30% off. On larger volumes it ran about the same being short 1-3ml. Though this is less concerning because of larger volume involved. Anyone else having problems with the V4?