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.

Specialty Spectrophotometers for Hazardous Water Monitoring

Posted By: Cole-Parmer Blog Team May 18, 2015

When conducting environmental testing, saline, and waste waters. These contaminants, such as mercury, are toxic and can produce severe health effects. While the use of mercury in industry is decreasing, environmental testing, as mandated by the EPA, evaluates the integrity of the water systems.

Cold Vapor Mercury Analyzers assess trace Hg levels in water samples and related eco-system impact. The mercury analyzer combines several high-performing instruments to achieve superb detection limits.

Oil Content Analyzers perform routine analysis of oil residuals. Use this analyzer to survey water quality and hazardous waste sites, monitor industrial wastewater, conduct post-cleaning discharge analysis, and measure adherent oil residuals on textiles and metal parts.

Specialty Spectrophotometers for Hazardous Water Monitoring

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