Hi all! I just purchased my first new box of syringes from Walmart today. I'm used to using U40 syringes and here I have some U100 1/2 mL 29 Gauge and 12.7 length. I'm a little confused as to how to convert this. From one chart I see that 1.6U would be 4U on the new U100 syringes. Is this correct? Thank you!