This is what I go by when there are kittens in my house

I thought it would be a nice guide for you as well. It is in grams, and your scale should be able to switch from oz's to grams. I know mine does that

Birth weight approx. 100 grams
day 3 - 5 approx. 130 - 150 grams / umbilical cord falls off
day 9 - 12 approx. 210 grams / eyes and ears will open
14 days approx. 230 grams / starts strolling about a little
16 days approx. 265 grams / starts cleaning itself and playing
21 days approx. 325 grams / starts to walk
25 days approx. 360 grams / first teeth coming through
28 days approx. 400 grams / rest of the milkteeth are coming through / 1st deworming / thorough examination for parasites / start litterbox training
5 weeks approx. 480 grams / becoming housetrained, can run pretty well
6 weeks approx. 540 grams / no longer need for bottle-feeding / has all milkteeth / can go without mother's milk and can eat independently / 2nd deworming
8 weeks approx. 600 - 700 grams / 1st vaccination (ask for vaccination passport !!) / 3rd deworming
10 weeks approx. 850 grams
12 weeks approx. 1000 - 1100 grams / 2nd vaccination