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.

Check Your Cumulative Rainfall with a Rain Gauge

TOPICS:rain gauges

Posted By: Cole-Parmer Blog Team June 19, 2015

Has your area has been particularly rainy? Even if you’re not a hydrologist or meteorologist, you may wonder how much rain has fallen. Rain gauges measure your accumulated level of precipitation.

These instruments may be cabled or wireless and are available in several types. Many gauges—even some on the more economical end of the spectrum—meet National Weather Service (NWS) specifications for statistical accuracy.

To get your best measurements, place your rain gauge where it can capture drops as they fall freely without bouncing into other objects. Professionals recommend placing the gauge up to five feet above the ground.

Keep in mind that weather events with extreme winds, such as violent storms and hurricanes, will not produce a reliable measurement on a rain gauge.

View our selection of rain gauges and other weather products.

Check Your Cumulative Rainfall with a Rain Gauge

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