Lab Measurement & TechniqueHESI A2 cheat sheet

Accuracy in practice

7 key facts 2 practice questions Reviewed Oct 2026

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Reading Volume

Read the bottom of the meniscus at eye level
Graduated cylinder for accuracy; beaker only for rough volume

Accuracy Vs Precision

Accuracy — close to the true value
Precision — repeatable, close to each other
You can be precise and still wrong

Sig Figs

Report only the digits your instrument supports

Safety

Add acid to water; goggles always; label everything

Key takeaway

Accuracy in practice

Before you read

Test yourself first: 2 questions

Question 1 of 2

Which laboratory measurement would you record in milliliters?

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