ISO/IEC 17025 · NABL scope CC-2214
The room where glass becomes an instrument.
Calibration is a measurement, and a measurement is only as good as its traceability chain. Ours runs unbroken from the SI kilogram to the serial etched on your flask.
Traceability chain
BIPM / SI kilogram
International definition
NPL India reference standards
National metrology institute
Our E2 reference weight set
Cert. NPL-2025-8841, recalibrated annually
Five-figure balances (XPR205, MSA225)
Daily drift checks, quarterly service
Your instrument's measured value
Published to the verification registry
Method
Gravimetric, per ISO 4787: the instrument is weighed empty, then filled to the mark with distilled water at a recorded temperature. Mass, water density, air density and glass expansion combine to give volume with an uncertainty budget computed per instrument — not copied per template.
Environment
27.0 ±0.5 °C, logged continuously; balances on granite anti-vibration tables; water conductivity checked each session. The room is audited annually by NABL assessors and, more usefully, every day by physics.
Also calibrated here
Third-party glassware. If your lab needs existing instruments recalibrated with NABL-scope certificates, we run a service queue with a five-day turnaround.
Ask about recalibration serviceEvery number this lab produces is public.
Serial in, certificate out — that is the whole interface.