Small test strips to check the silver and acid content of fixer. True, you could just keep tally of how many prints you've made, but that only works if your records are extremely accurate. Test strips cost only 20 cents per strip, and a new liter of fix only around 50 cents...
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These strips are indispensable for photo labs or if you have a tank that holds more than 1 liter of fixer. In this case they can save you a good sum of money.
Always test at the bottom of the dank, because silver is heavy and will sink to the bottom.
100 strips for 100 tests.