My son accidentally broke the two glass tubes that came with the ammonia and pH test kits. Just when I needed it most, I had nothing. The pandemic made matters worse, with Petco and PetSmart always selling out. So I made sure to order a set of 24 in case of further accidents. The glass isn't that thick, but it's clear, so you can read colors well, which is important. I'm skeptical about using plastic bottles because I'm not sure how transparent they will be for a good read. Also, I prefer glass for general viewing. I wish the glass was more durable as SAR when cleaning is another issue, tiny bits of glass can be overlooked and end up in your bare feet. Ouch! General: Good for checking color on a clear day. Cost: Could be cheaper as broken glass always needs to be replaced.
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