How to Calibrate Your Laboratory Scale Correctly

Accurate measurements are essential in any laboratory. However, even the best scale only provides reliable results if it is regularly calibrated. In this article, we’ll explain what calibration means and guide you through the process step-by-step.

🔍 What Does "Calibration" Mean?

Calibration checks how much the scale’s displayed weight deviates from the actual weight. It involves documenting the deviation without adjusting the scale’s readings.
If the display is adjusted to correct the measurement, this is called adjustment or justification.

🧰 What You Need for Calibration

• A certified calibration weight (preferably with a DAkkS certificate)
• A stable, vibration-free location
• A warmed-up scale (turned on for at least 30 minutes)

Tip: Calibrate your scale ideally before the first use of the day.

🪜 Step-by-Step Calibration Guide

1. Turn on the scale and let it warm up
   Modern devices often require 30–60 minutes to stabilize temperature-wise.
2. Zero the scale
   Use the tare function to set the scale to zero, optionally with an empty container on the pan.
3. Place the calibration weight
   Use the weight specified by the manufacturer (e.g., 100 g, 200 g).
4. Note any deviation
   For example, if the scale shows "99.97 g" instead of "100.00 g," record the difference.
5. Adjust the scale (optional)
   Many scales have an internal adjustment function to correct the displayed value.

🔄 How Often Should You Calibrate Your Scale?

• Daily or before every critical measurement
• After relocating the scale
• After prolonged disuse
• Before audits or official inspections

🛠️ Internal vs. External Calibration

Internal calibration: The scale uses a built-in reference weight.
External calibration: A calibration weight is manually placed on the scale.

The latter is more time-consuming but compliant with GLP and fully documentable.

🎯 Conclusion

Regular calibration is key to reliable measurements. It’s quick, protects against errors, and builds trust—especially in sensitive areas like pharmaceuticals, food production, and research.

🔧 Questions about calibration?

Our team is happy to help! Or browse our category: Calibration Weights.