EAA is importing them again. Go to eaacorp.com
Try gun shows, Shotgun News, Gun List, local gun shops.
Rain gauge is basically used to meassure the amount of rain fall.
you can buy parts for this gun at www.e-gunparts.com
The main parts of a Marking Gauge is the Fence and Stem. The fence is the adjustable part and th estem is what holds the spur.
The cuff, gauge, pump (and the tubing that connects them).
Try e-gunparts.com
The two main parts of a psychrometer are a rain gauge and a mesauring stick
You can purchase parts for a Ranger model 30 16 gauge shotgun at these locations. Gunbroker, Topgunsupply, Budsgunshop, Gunpartshop and Midwayusa.
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We have parts for that model. sales@countrygunsmith.net
i would start my search at numrich gun parts corp.
The parts of this apparatus include the bladder, aneroid gauge, tubing, and ear piece.