Laboratory · Accredited calibration (DPA LK 005)
Every test result, every batch of concrete and every invoice by weight depends on a balance that reads true. We calibrate non-automatic weighing instruments of every accuracy class, from analytical balances reading milligrams to platform scales of 20 tonnes, on your premises and under ISO/IEC 17025 accreditation.
Our calibration laboratory is accredited by the General Directorate of Accreditation (DPA) under registration LK 005, granted on 06.08.2025 and valid until 05.08.2029. Calibration follows EURAMET Calibration Guide No. 18 (version 4.0), the European reference method for non-automatic weighing instruments.
Who needs accredited calibration
- Testing laboratories: ISO/IEC 17025 requires traceable calibration of every balance used for results.
- Concrete, asphalt and precast plants: batching scales and the balances of the plant laboratory.
- Food, pharmaceutical and chemical producers working under ISO 9001, HACCP or GMP.
- Warehouses, logistics and trade, where goods are sold or shipped by weight.
- Any company whose quality system or customer audit asks for calibration certificates.
Accredited scope and measurement uncertainty
Non-automatic weighing instruments of accuracy classes I, II, III and IV, calibrated with standard weights and substitution loads. The uncertainties below are the best values in our accredited scope; the uncertainty stated on your certificate depends on the instrument’s resolution and behaviour.
| Load range | Measurement uncertainty |
|---|---|
| 1–100 mg | 0.04–0.08 mg |
| 0.1–1 g | 0.08–0.1 mg |
| 1–10 g | 0.1–0.2 mg |
| 10–100 g | 0.2–0.4 mg |
| 100–200 g | 0.4–0.74 mg |
| 200–500 g | 0.74–1.4 mg |
| 0.5–1 kg | 1.4–2.6 mg |
| 1–2 kg | 2.6–5.7 mg |
| 2–5 kg | 0.057–0.14 g |
| 5–10 kg | 0.14–0.29 g |
| 10–20 kg | 0.29–0.57 g |
| 20–60 kg | 0.57–4.2 g |
| 60–100 kg | 4.2–8.5 g |
| 100–200 kg | 8.5–17 g |
| 200–500 kg | 17–42 g |
| 500–1000 kg | 42–57 g |
| 1000–4000 kg | 0.057–1 kg |
| 4000–20000 kg | 1–10 kg |
Method: EURAMET Calibration Guide No. 18, Version 4.0 (11/2015). Accreditation: DPA LK 005, valid to 05.08.2029.
How a calibration is carried out
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Preparation
We check the instrument’s level, warm-up, environment and readability, and record its identification and class.
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Repeatability
Repeated weighings of the same load show how consistent the instrument is.
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Eccentric loading
The load is placed at different points of the pan or platform to detect corner errors.
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Errors of indication
Reference weights, and substitution loads for heavy scales, are applied in steps across the range in use.
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Uncertainty
Every result is reported with its expanded measurement uncertainty, calculated to EURAMET cg-18.
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Certificate
An accredited calibration certificate bearing the LK 005 mark, ready for audits.
What your calibration certificate contains
- Instrument identification: make, model, serial number, capacity, readability and accuracy class.
- Calibration conditions, date and location.
- Results of repeatability, eccentricity and errors of indication.
- Expanded uncertainty of measurement for each calibration point.
- Traceability of our reference weights to national and international standards, and the accreditation mark.
Frequently asked questions
How often should a balance be calibrated?
Most quality systems require it every 12 months, and sooner for heavily used or critical instruments, or after a repair or relocation. Your quality system or auditor sets the interval.
Do you calibrate on site?
Yes. Our accreditation covers calibration at your premises, so the instrument is calibrated where it is used and you avoid transport.
Is calibration the same as legal verification?
No. Legal (metrological) verification for trade is carried out by the state metrology authority. Calibration gives you the measured errors and their uncertainty, which ISO/IEC 17025 and ISO 9001 quality systems require.
Related testing
Send us the list of instruments: type, capacity, readability and location. We’ll plan one visit for all of them and send a quote.