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The COVID-19 IgG/IgM Rapid Test Cassette is for the detection of IgG and IgM antibodies in blood and requires a buffer that isn't included inside the foil packaging. This is a PBS solution of adequate strength and pH value of around 7.4. This can be used for many other similar tests requiring a buffer. These are 10ml droppers which is enough for over 100 tests (each test requires only two drops or around 80μL).