Description
This Test Kit Refill is for use with Hydrotools Model 8410 and 8420 test kits.
- One (1) each ½ ounce bottle of Phenol Red pH level test solution
- One (1) each ½ ounce bottle of OTO Chlorine/Bromide level test solution
- Part #8450
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Quality Water Test Kit Refill – Replacement Oto Chlorine Test And Phenol Red Solutions for your collection.





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