RedSea Test Kit Question

[Gyarados]

The kit says to fill the vial exactly 2 ml, I’m just curious what’s the correct way of filling 2ml with their provided syringe.
picture 1: to the flat part
Or
Picture 2: to the bottom cone part
Thanks in advance!

 

[blaxsun]

First image (the 'tip' on the plunger is the size of the volume in the tip of the syringe).

 

[Gyarados]

Thanks