Crossword Genius

Medical device for reading pet barcodes? (3,7)

Ross

I believe the answer is:

cat scanner

I'm a little stuck... Click here to teach me more about this clue!

'medical device' is the definition.
(I've seen this in another clue)

'reading pet barcodes?' is the wordplay.
I cannot really see how this works, but
'reading' could be 'r' (one of the traditional three R's of education) and 'r' is found in the answer.
'pet' could be 'cat' (cats are often kept as pets) and 'cat' is found within the answer.
This explanation may well be incorrect...

'for' acts as a link.

Can you help me to learn more?

I've seen this clue in The Guardian.
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