How to find key values of a chain?
Update:

Based on your other question: Possible to identify sprocket without taking the bike apart? - you have a Nexus internally geared hub, which would mean you may need a single speed chain.



For derailleur gear equipped bicycles you just need to get a chain compatible with the number of gears ('speeds') on the rear sprocket cassette. More gears require a chain with a narrower outer width because the sprockets are closer together.

Generally speaking derailleur chains are available in  6, 7 and 8 speeds; 9 speeds; 10 speeds and 11 speeds.

Just for completeness and to address the 1/2" x 3/32" measurements on your current chain:


All bicycle chains have 0.5 inch pitch (distance between center of the pins)
All chains for derailleur gear equipped bicycles measure 3⁄32 inch between the inner plates. (Single speed chains use a wider 1⁄8 inch inner width.)