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.

Tech Notes: Replacing Batteries in Your Oakton Instruments EcoTester

Have you received the b-a-t error message on your Oakton^® Instruments EcoTester™ or does it fail to turn on? Is it time to replace the batteries? Here’s how:

Oakton® Waterproof EcoTestr™ pH 2 Pocket pH Tester

For best results, change the batteries when your EcoTester is at room temperature. To remove the previous batteries, slide your thumb under the pocket clip to release the back tab. With your thumb under the pocket clip, grasp the battery cover with your other hand. Hold the cover with your fingers and release the front tab with your thumb to remove the cover.

If the cover does not come off easily, use this alternate method: First, place your thumb under the front tab with your finger over the top of the battery cover. While holding this position, place the thumb of your other hand under the back pocket clip and lift to release. The battery cover should now pop off. Remove the old batteries and replace them with new ones—EcoTesters use four LR44 or A76-type 1.5 volt alkaline batteries. When putting the new batteries in, note the polarity guides in the battery compartment.

With the new batteries installed, replace the cover with the pocket clip on the back. Push down firmly and listen as the front and back tabs snap into place. Gently tug cover to ensure a secure fit. Once again, you’re ready to take measurements. No need to recalibrate—the non-volatile memory retains the calibration.

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Tech Notes: Replacing Batteries in Your Oakton Instruments EcoTester

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