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| My colorimeter does not seem to be giving me a correct reading. What things should I try before calling for help? |
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- Verify that the correct sample tube is being used.
- Verify that the same sample tube is being used for both zeroing and sample testing.
- Verify that the tube is clean and free of fingerprints and dirt.
- Verify that the tube is being positioned the same way every time. (Most colorimeters and tubes have an index that must be aligned before taking a reading.)
- Verify that the reagents are not expired.
- Verify that the batteries in the colorimeter are not low.
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