I bought mine from Dr. Fosters and Smith when they were running the special buy for Reef Central. Both Kwajrocks and 8Ball told me that the numbers/scale on mine appear larger than those on theirs. I don't know where they got theirs. You don't have to worry about it now, but it's definitely a plus for those of us whose eye sight is beginning to get weak with age.
You should get a proper calibration solution for it and check its calibration initially and periodically thereafter, although it does not drift like a pH meter even when it's old.
Tomoko