If your turntable isn't running at the right speed, simply follow the manufacturer's instructions to adjust the speed, then check again with Grooved until just right.
Grooved lets you calibrate the speed of your turntable by simply playing a record.
I'm not gonna lie to you, if that's your situation then maybe Grooved isn't going to be super helpful but hey, who knows maybe you want to double check.
Maybe you're the lucky owner of one of those turntables with the little strobe thingie that already lets you calibrate the speed visually.
Grooved tells you if your turntable is running fast, slow, or perfectly.