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.

Preventing Airflow Issues from Creating Lab Accidents

Biosafety Enclosure

With the potential for fumes and contaminants to be present in laboratories, airflow—and its proper distribution—is a concern. In 2012, a germ lab at the Atlanta Centers for Disease Control (CDC) experienced ongoing issues with airflow systems designed to help prevent the release of infectious agents. More recently, a report from Lab News in the UK indicated more than 70 incidents at labs were investigated. A consultant interviewed for the article stated investment in the right airflow monitoring equipment can reduce risks.

While the choice of airflow equipment may depend on the size and type of lab, monitoring airflow for contamination control is vital. From airflow measurement instruments to particle counters to fume hoods, the portfolio of products designed to sustain laboratory air quality is vast.

OSHA offers guidance on laboratory safety, which includes engineering controls and air containment standards for specific chemical hazards. For laboratory directors and supervisors who are charged with maintaining the safe operation of the lab, vigilance—coupled with well-chosen, reliable equipment—will limit accidental exposures.

Preventing Airflow Issues from Creating Lab Accidents

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