Largest mezuzah

The world’s largest mezuzah parchment measured 94 cm (37 in) long and 76 cm (30 in) wide and its container measured 110 cm (43.3 in) long on 19 May 2004. It was scribed by Avraham-Hersh Borshevsky of Jerusalem, Israel.

The typical height of the Hebrew inscription measures (or rather the distance from the top of one line of inscription to the top of the line of inscription below it) is 4-6mm (0.15-0.2 in), here it is 40 mm (1.5 in), with the average size of the letters being 18 mm (0.7 in) tall.

A standard mezuzah consists of two sections of the Old Testament (Deuteronomy 6:4–9, 11:13–21) hand-written in Hebrew on a single piece of parchment rolled up and placed in some sort of container on the door frames of Jewish homes. This has been practiced among Jews worldwide for thousands of years in literal fulfillment of Biblical verses intimating that these Old Testament sections be “written on your doorposts.”
The typical size of a mezuzah is 6-15 cm (2-6 in) high.