Worst zeroing procedure I've ever seen: must remove end cap and loosen screws to allow adjustment (tiny, fragile parts); adjusters have no detents, stops, or calibration marks; changing one adjustment alters the other. Don't waste your money - false economy.
Pros: Light, inexpensive
Cons: Difficult to adjust to zero
This review was written in the old system and had content requirements that are different than reviews written today.