At risk of Jinx-I also gave up on that. I gave up on PH strips too.
I'm going to put my efforts into speeding up my brew and hitting numbers.
Once we get comfortable with brewing process we do not need tto measure everything.
Let say I almost do not bother measure FG any more.
Beer should be fermented in 2 weeks.
If it is not, brew another beer and make it ferment in 2 weeks.
You can just say if mash is converted or not just looking at it.
Brew more = become a better brewer.