Your syringe reads in 0.01 ml increments. You have fine lines between the bold lines that are 0.01 mls.
The low (1mg/Kg), 5-day dose of fenbendazole will only treat roundworms and cecal worms with no egg withdrawal period.
Aquasol is very concentrated at 200 mg/ml and designed for de-worming very large flocks via their drinking water as the goat wormer version of fenbendazole is not miscible in water.
You would not only have to calculate the correct dose (you already have) you would need to make sure the birds drank all the dosed water. Each day. How much do they drink?
For such a small flock you would be better off using Safeguard liquid goat wormer at a rate of 25 mg/Kg per bird per day for 5 consecutive days to remove nearly all worms they may have.
However, you have been a member for a while. Is it safe to assume you have hens and not pullets? Hens that could still be in molt? If so, fenbendazole is not a good choice of de-wormer due to the risk of affecting feather growth.
Are your birds known to have worms?
If you want to do the 1mg/Kg dose individually, a 5# bird would need 0.011 mls of the as packaged concentrated Aquasol bottle each day. To make it easier, you can dilute that bottle with 9 parts water (67.5 mls) to bring the concentration to 20 mg/ml and dose each bird with 0.11 mls of the diluted mix per 5# bird per day.
After shaking the diluted mixture, you would draw up 0.66 mls and dispense as shown. Down to 0.55 for bird #1, 0.44 for #2, 0.33 for #3, 0.22 for #4, 0.11 for #5 then empty the syringe for #6.
Repeat daily for 5 days.
It wouldn't hurt to use a little more. You could very safely double the amount per bird without ill effect on feather growth. If they are molting, you likely aren't getting eggs. At a 2mg/Kg dose, I'd readily eat any eggs laid but would never give away or sell them.
