Picture shows 3/4 oz each bottle but description states 1/2 oz, which is it?

my purchase was 3/4 oz bottles. these are working well

When do these expire?

There should be an expiration date on each bottle. Do not use after expired test results can’t be guaranteed

Do these work with any other test kits?

Probably not. It's a matter of water to drop ratio. These are replacement drops for their test kit. Once you have the test kit, you can purchase these as a replacement. Test kit isn't that expensive. Very reliable.

Manufacturer	Chem Lab Products, Inc.
Item model number	79300CLX
Product Dimensions	2.54 x 5.08 x 12.7 cm; 14.17 g
ASIN	B00PZZFTUG

Clorox® Pool&Spa™ スイミングプール 3ウェイ水テストキット 詰め替え液、0.5オンス (1パック)

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Clorox® Pool&Spa™ スイミングプール 3ウェイ水テストキット詰め替え液、0.5オンス (1パック)