I think the cartridge on my turntable may have already been replaced, but I'm not sure. The previous owner said it was her ex's and that he'd serviced it when h

I think the cartridge on my turntable may have already been replaced, but I'm not sure. The previous owner said it was her ex's and that he'd serviced it when he owned it, and the current cartridge is a Grado, which I understand is a reputable brand? I've still obviously got a lot to learn about vinyl haha.