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.

Ask the Tech Expert: James | from Cole-Parmer Blog

If you’re using a pen-style pH meter and getting inaccurate readings, you may want to talk to James. As a technical support team member, James did some troubleshooting for a panicked customer. He discovered the pH probe in question was not connected to the BNC-style pH meter—thus not producing appropriate readings. After sending the customer the correct probe, the issue was resolved.

Yet, troubleshooting is not the only help James provides. Because he answers customers’ questions every day, he has developed quite a range of expertise. “I continually expand my knowledge base,” he said.

In addition to electrochemistry, this base includes a degree in chemistry and specialized knowledge of spectroscopy. So if you need help selecting a product, determining compliance, or getting more specific information, James can help you.

Or, if you want to chat about how Minnesota teams are doing, this native Minnesotan is also happy to oblige.

Have a question about UV/Vis spectrometers or pH meters and water quality products? Contact our technical support team.

Ask the Tech Expert: James

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