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These refill bottles are suitable for PH and CL test kit, each bottle has color coded cap yellow for the OTO (Orthotolidine) Chlorine Test Solution and red for Phenol Red pH Test Solution These dropper bottles can accommodate ½ ounces of OTO (Orthotolidine) Chlorine Test Solution and Phenol Red pH Test Solution Made from durable plastic material, does not break easily and it has secured, air tight caps to avoid liquid spills Lightweight, you can take it anywhere, does not need large space and can easily fit on ordinary pockets
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