1cc syringe?

I'm pretty sure our little girls have mites one has been scratching quite a bit and they came from a pet store. There isnt any hairloss and there both eating, drinking, and poop'ing fine but I noticed what looks like dandruff by the ears. At first I figured it was just from the gross bedding they were on in the store but they've been on all fleece and carefresh for like 2 weeks now. I'm going to get a scale hopefully tonight or first thing in the morning but have no idea where to find a 1cc syringe the closest I could find was an eye dropper with .1cc, .2cc, .3cc, .... markings on it. Our girls are still really small so i'm guessing the dose is going to be like .034cc of Ivomec is it safe to just try to eyeball a little less then half a .1cc increment or does anyone know a good place to look for a smaller syringe?

Also I'm useing Guinea Lynx -- Topical Ivermectin Treatment to get the dosage our ivomec just got here today, I bought
(broken link removed) just wanted to make sure thats the right stuff before I use it on them. On a lighter note I was shocked at how much a little mite medicine cost till it got here today and I realized I had order a really big bottle lol. Sorry for the long post and thank you for your help.