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| Frequently Asked Questions - Laboratory |
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| After adding DPD to my water sample, the water flashed pink and then faded to colorless. What could be happening? |
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| How often should I calibrate my pH meter? |
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| I’ve replaced the membrane and the fill solution on my DO meter and I’m still having problems getting steady, reliable readings. Any suggestions? |
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| What method should I use for ammonia testing? |
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| How long can I expect my pH probe to last? |
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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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| What is the difference between vacuum and peristaltic samplers and which one is right for my application? |
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| What’s the difference between primary and secondary calibration standards? |
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