I'm about to order the TF - 100 Test Kit. How often on average does one have to replenish the reagents? From the kit, which ones seem to run out first? I am considering ordering some refills at the same time as I order the kit Is this a good idea? Do the reagents go "bad" or is it feasible to order extras at this time? It would save me some aggravation of finding a source for when I do need a refill
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