יום שלישי, ב׳ חשוון תשפ״זTuesday, October 13, 2026
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Moshe Gantz (i.e., the Mezuzah Doctor) and Joseph Miller are the founders of KosherKlaf.com, which offers a trusted way to purchase high-quality STaM (Sefer Torah Tefillin Mezuzot and Megillot) with complete transparency. KosherKlaf carries STAM that reflect all minhagim in six levels of quality, and expert guidance so customers can confidently choose the quality they want. The authors also offer checking services, and educational support for schools, and communities.
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By Moshe Gantz and Joseph Miller
Another crucial feature: the writing must endure. The general laws of writing recognize a difference between something that leaves lasting writing and a substance that merely creates a temporary mark.
By Moshe Gantz and Joseph Miller
We should be careful not to confuse a hiddur with basic kashrus. A beautifully smooth sheet of klaf is not automatically more kosher than a less attractive one. Likewise, white parchment is not inherently superior simply because it looks cleaner.
By Moshe Gantz and Joseph Miller
the parchment maker is not simply producing a nice piece of leather for the sofer. The thickness of what remains and the surface upon which the writing will eventually be placed can themselves have halachic consequences.
By Moshe Gantz and Joseph Miller
Klaf for STaM is not prepared like ordinary leather. Halacha requires the parchment to be processed lishmah, for its sacred purpose.
By Moshe Gantz and Joseph Miller
We do not generally find holiness by abandoning the physical world. We sanctify time through Shabbos, food through mitzvos and berachos, money through tzedakah, and our homes through the Torah life lived within them.
By Moshe Gantz and Joseph Miller
The mezuzah is not guarding the house independently. Hashem is guarding the house.
By Moshe Gantz and Joseph Miller
Checking the mezuzah fits naturally into the theme of Elul. Elul is a month of inspection. We inspect our actions, our relationships with others, our tefillah, and our observance of mitzvot.
By Moshe Gantz and Joseph Miller
I would much rather provide someone with a carefully written and thoroughly inspected 7 cm mezuzah than have them unknowingly purchase a lower-quality one somewhere else.
By Moshe Gantz and Joseph Miller
A knowledgeable STaM professional should welcome your questions. They should be happy to explain the ksav, the sofer, the quality of the klaf, the inspection process, and the differences between the various levels of hiddur.
By Moshe Gantz and Joseph Miller
The megillah functions differently. It is read all at once from beginning to end. Since there is no need to leave it open in the middle, one roller suffices according to Shulchan Aruch.
By Moshe Gantz and Joseph Miller
When tefillin are purchased from a reputable source and treated properly, most remain kosher for many years. In the experience of many sofrim, most invalidations come from pairs that were never properly made to begin with.
October 9, 2026 
