If you insist on spending more, but a Pyrex graduated cylinder for you hydrometer. That and 2 hydrometers are all you need for gravity(because hydrometers are fragile and one will break at the worst time).
Give it 2-3 weeks then test, if bottling, test again 2-3 days later. Make sure you adjust for temperature per the calibration temp on your hydrometer if cold crashing. Google for a calculator.
My recommended stepping stones for new AG brewers:
1)sanitation
-keep a few bottles of star San made with distilled water in chemical grade spray bottles around, but out of sun light. Remember star San takes a couple minutes to work so a quick spray won't do it alone
2)temperature
Own your mash and fermentation Temps
Keep records of your mash Temps so you know how much your tun absorbs and can make solid adjustments on your next brewday.
3) pH
This is where I am. Focusing on my pH throughout the process, from dough in to final product
Note, I am blessed with great water post filtration and Camden.
I believe that if you take care of those three things, pitch good yeast and have a good recipe and crush, you will make consistent and good beer. I've made great brew without tinkering with pH but I love hop bombs and dark beer as well, which require differences in pH.