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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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🇺🇸 Ship from USA · On Agora since 2026
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