Question 1

How often should pipettes be calibrated?

Accepted Answer

Most laboratories calibrate every 6 or 12 months. ISO 8655 does not mandate a fixed interval — it expects you to justify yours based on how the instrument is used. Heavy daily use, corrosive or viscous reagents, multiple users, and regulated work all push toward a 3- or 6-month interval. Light, single-user, non-critical work can often justify 12. We will help you set an interval you can defend and adjust it based on your own as-found failure data.

Question 2

What is the difference between calibration, verification, and preventive maintenance?

Accepted Answer

Preventive maintenance is the mechanical service — teardown, cleaning, seal replacement, lubrication — that restores an instrument's condition. Calibration is the gravimetric measurement that establishes what the instrument actually delivers against its specification. Verification is a check against tolerance without adjustment. Our Silver plan is PM plus functional testing; Gold and Platinum add documented gravimetric calibration.

Question 3

What does ISO/IEC 17025 accreditation mean for my lab?

Accepted Answer

ISO/IEC 17025 governs the competence and consistency of the calibration laboratory itself: how methods are controlled, how equipment is maintained and traced to national standards, how uncertainty is calculated, and how results are reported. When an auditor asks where your pipette calibration traceability comes from, this is the answer they are looking for.

Question 4

How do you calculate measurement uncertainty?

Accepted Answer

Uncertainty is built from the contributing components of the gravimetric method — balance resolution and repeatability, the traceable weight set, water density and its temperature dependence, barometric pressure, relative humidity, evaporation, and the operator contribution — combined and expanded to a 95% confidence level (k=2). It is included on Platinum reports on request.

Question 5

What happens if an instrument fails as-found?

Accepted Answer

We record the as-found result before touching anything, notify your quality contact promptly, then service and recalibrate. That as-found data is what lets you scope an impact assessment on work performed since the last calibration. An out-of-tolerance result is a finding, not a failure of the program — the failure would be not knowing.

Question 6

Do you service pipettes from every manufacturer?

Accepted Answer

We service all major air-displacement brands, including Eppendorf, Gilson, Rainin, Thermo Fisher, Sartorius, Hamilton, BRAND, VWR, Oxford, Socorex, and more. Send us your instrument list and we will confirm coverage and parts availability before you commit to anything.

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