What is the difference between an analytical balance and a precision balance?

An analytical balance provides readability of 0.1 mg or better, while a precision balance typically reads to 0.001 g or 0.01 g. Analytical balances include draft shields and are designed for highly sensitive measurements. Precision balances handle larger samples and are less affected by environmental conditions.

What readability do I need for my lab application?

You need a readability that is at least one-tenth of your smallest sample weight or required measurement increment. For example, measuring 100 mg samples may require 0.01 mg readability, while gram-level work may only need 0.01 g. Selecting higher readability than necessary increases cost without improving results.

Do lab balances need to be calibrated?

Yes, all lab balances require regular calibration to maintain accuracy. Calibration ensures measurements remain traceable to certified standards. Internal calibration simplifies this process by automating adjustments, while external calibration requires manual verification with certified weights. In regulated environments, calibration records must be documented and retained.

What is the difference between readability and repeatability?

Readability is the smallest increment of weight a balance will display. Repeatability is the degree of agreement between multiple measurements of the same mass, on the same balance, under the same conditions.

What is the best way to clean my balance to ensure accurate readings?

Inspect and clean before each use. A flannel cloth or soft brush works well for dusting and light cleaning. Use a non-abrasive cleaner for light spills, and a dry flannel cloth for glass parts. Set a regular maintenance schedule for deep cleaning to ensure optimal performance and instrument longevity.

Can vibration affect the accuracy of my balance?

Yes — even slight vibration from a heavy footstep can affect accuracy. Place the balance on a sturdy benchtop away from high-traffic areas such as hallways, elevators, stairways, and doors. If that placement is not possible, an anti-vibration table should be considered.

Tech Challenge: Which Hydrometer Would You Suggest?

Take the challenge and see if you’re right!

Measuring Alcohol Content in IPA Beer Batches

Indiya from Home Microbrew would like to measure the alcohol content in her IPA beer batches to assure consistency. She is not sure what methods are typically used to get the specific gravity reading, as she saw many calculators and conversion tables online.

What would you suggest for her small home-based company?

A 0 to 20% alcohol content hydrometer such as the H-B Instrument Alcohol Proof Ethyl Alcohol Hydrometer
A 0 to 200% alcohol content hydrometer such as the H-B Instrument Alcohol Hydrometer, 0 to 100% Tralle, 0 to 200 Proof, Combined Form
A specific gravity hydrometer such as the H-B Instrument Hydrometer, 1.000 to 2.000 Specific Gravity, 0.01 Divisions, Plain Form
A hydrometer jar such as the Thermo Scientific^™ Nalgene^™ Hydrometer Jar

Answers:

1. A 0 to 20% alcohol content hydrometer such as the H-B Instrument Alcohol Proof Ethyl Alcohol Hydrometer (08296-01)

Correct! IPA beers typically have an alcohol content between 4 to 8%. Though the content may be slightly higher for home brewers, it still falls within the range of the hydrometer. These hydrometers are very easy to use and this model will keep her from having to convert the specific gravity readings to alcohol content through a table.

2. A 0 to 200% alcohol content hydrometer such as the H-B Instrument Alcohol Hydrometer, 0 to 100% Tralle, 0 to 200 Proof, Combined Form (08285-58)

Although this hydrometer would work, IPAs usually have alcohol content below 10%, so this range would not allow great resolution—and therefore accuracy—for Indiya’s needs.

3. A specific gravity hydrometer such as the H-B Instrument Hydrometer, 1.000 to 2.000 Specific Gravity, 0.01 Divisions, Plain Form (08298-94)

Incorrect. Using this method, Indiya would have to convert the specific gravity readings to alcohol content by using a conversion table. There are more direct ways for her to determine the alcohol content.

4. A hydrometer jar such as the Thermo Scientific Nalgene Hydrometer Jar (06135-65)

Incorrect. A hydrometer jar does not provide any readings; it is made to hold hydrometers. A graduated cylinder may also be used or any other type of clear jar so the meniscus of the liquid level can be read against the scale of the hydrometer.

Tech Challenge: Which Hydrometer Would You Suggest?

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