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Using it for several years with no problems. Good stuff

MTC and Optisan are different companies. Optisan warranty is lifetime as well as transferable.

They are actually different companies with different manufactures. Optisan is a manufacture making their own brand "Optisan", MTC distributed Optisan in the UK for several years with the MTC designed SCB reticle. So the names are often confused as the same company. The two companies have parted...

There is a fine machined line between the notch that indicates the setting. Picture below and instructions here: http://foto.huma-air.com/foto/how%20to%20adjust%20the%20regulator%20pressure.pdf