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The pen (wand) type bar code scanners work best for tabulations. These connect to the USB port of the computer.
Any pen type scanner that can read and decode Code 39 should work.
Notes on using scanners:
When using a USB to PS/2 adapter the bar code may not reading properly (missing characters). This may corrected by setting the inter-character delay, Use the shortest value that allows the reader to work properly (ex. 3 ms). This appears the caused by transmitting the code to fast. The delay causes a pause between characters. NOTE: ALL USB to PS/2 adapters are not the same. Some work and some don't with scanners. TEST prior to the contest.