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.

As Featured on the Today Show: Cole-Parmer Rain Gauge

TOPICS:Rain gauge

Posted By: Cole-Parmer Blog Team July 9, 2015

Rain gauges can help you water your lawn. On the July 8^th broadcast of the Today Show, the Cole-Parmer^® Clear Rain Gauge (see picture above) was one of the featured products in a segment on ways to save over the summer, adapted from an article by AARP. See the tip below and watch the segment!

TODAY Show Tip: Buy a rain gauge. Monitoring weekly rainfall with a simple rain gauge can save you big money on watering your lawn, since most lawns require just two inches of water per week during the summer months. Keep track of how much rain you receive, then just top-off your lawn to bring it up to the two-inch level.

As Featured on the Today Show: Cole-Parmer Rain Gauge

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