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    "title": "The Hidden Volume Error in Your Peptide Pen",
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    "tldr": "A hidden volume error is the gap between the click-dial setting and the volume your peptide pen delivers. Verify it by dispensing water onto a lab scale.",
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            "value": "A hidden volume error is the gap between the click-dial setting and the volume your peptide pen delivers. Verify it by dispensing water onto a lab scale.",
            "source": "Lab article (https://www.preppinpeppers.com/blogs/the-lab/the-hidden-volume-error-in-your-peptide-pen)",
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            "value": "Hidden Volume Errors",
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            "value": "How a Click-Dial Pen Works",
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            "value": "Why Volume Accuracy Matters for Your Bench Work",
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            "value": "Maintaining Accuracy and Troubleshooting",
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            "value": "Related reading",
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            "value": "What the research community gets wrong about verifying volume in a peptide pen",
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            "value": "Gansulin Pen · Reusable Click-Dial, 3 ml (1-60 Units)",
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            "value": "NIST Office of Weights and Measures, SI Units - Volume (mL as cubic centimeter, volume measurement standards) - www.nist.gov",
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            "value": "Bohannon, Postgrad Med 1999: Insulin delivery using pen devices. Simple-to-use tools may help young and old alike - pubmed.ncbi.nlm.nih.gov",
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            "value": "Jonker et al., Int J Clin Pharmacol Ther 2021: First pre-filled pen device with highly purified human menopausal gonadotropin (HP-hMG, Menopur) in liquid is shown to be bioequivalent to powder for reconstitution - pmc.ncbi.nlm.nih.gov",
            "source": "Lab article (https://www.preppinpeppers.com/blogs/the-lab/the-hidden-volume-error-in-your-peptide-pen)",
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            "value": "Sanders, J Vis Exp 2012: Aseptic laboratory techniques: volume transfers with serological pipettes and micropipettors - pubmed.ncbi.nlm.nih.gov",
            "source": "Lab article (https://www.preppinpeppers.com/blogs/the-lab/the-hidden-volume-error-in-your-peptide-pen)",
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            "value": "Shang et al., Sci Rep 2018: A Study on Micropipetting Detection Technology of Automatic Enzyme Immunoassay Analyzer - pubmed.ncbi.nlm.nih.gov",
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    "faq": [
        {
            "q": "How often should I check my peptide pen's volume accuracy?",
            "a": "Perform a quick check at the start of a major experiment series, or monthly if used frequently. Always check after dropping the pen or if the plunger feels sticky."
        },
        {
            "q": "Can I use a graduated cylinder instead of a scale to check volume?",
            "a": "A scale is more precise. A small graduated cylinder has a tolerance that can hide errors of 0.05 ml or more, which is significant for peptide concentrations."
        },
        {
            "q": "What if my pen delivers different volumes at different settings?",
            "a": "Test at multiple points (e.g., 0.2 ml, 0.5 ml, 1.0 ml). Inconsistency indicates a mechanical issue with the dial mechanism or a worn plunger."
        }
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