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Low range pH test kits

Does anyone have any idea where I could find a narrow (low) range pH test
kit. I have a Tetra pH one and a paper with 5.5, 6.0 and 6.5 is just not
tight enough.  I know LaMotte makes (or did) make one, I've read comments
about it by George Booth on this list.  I've looked at LFS's, Pet Warehouse
and Big Al's among others.  If anyone has any ideas, please let me know.