Precision you can certify. Accuracy you can prove.
Gramton delivers NABL-traceable calibration for weighbridges, platform scales, load cells and precision balances — engineered for auditors, trusted by plant heads across India for 25+ years.
25+
Years experience
5000+
Customers served
1,00,000+
Instruments calibrated
Pan India
Engineer coverage
CERTIFICATE SNAPSHOT
GWA-CAL-2026
Traceability
To National Standards
Standard
ISO/IEC 17025:2017
Uncertainty
Stated on Report
Format
Digital + Hard Copy
Turnaround
Same-Day On-Site
About NABL Calibration
What NABL means, why calibration matters, and the plain-language distinctions your QA and audit team will ask about.
What is NABL?
The National Accreditation Board for Testing and Calibration Laboratories, under the Quality Council of India, accredits labs against ISO/IEC 17025 — verifying equipment, staff and procedures on an ongoing basis.
Why calibration matters
Every weighing instrument drifts through wear, temperature change and load-cell fatigue. Calibration re-establishes the true relationship between what an instrument shows and what is physically correct.
Traceability, simply put
The test weight used on your scale links, through an unbroken chain of comparisons, back to a national or international reference — documented on every certificate we issue.
Measurement uncertainty
No measurement is perfectly exact. NABL certificates state the margin explicitly (e.g. ± 0.05 kg), letting QA make a defensible pass/fail call instead of guessing.
Calibration vs. Verification vs. Stamping
Calibration
Compares against a traceable reference; documents deviation & uncertainty.
Verification
A pass/fail confirmation against a specified tolerance.
Legal Metrology Stamping
Government mandate confirming fitness for trade — separate from NABL calibration.
Internal Calibration vs. NABL Calibration
The distinction auditors check for first — and the compliance badges the page reinforces it with.
Internal Calibration
Performed by your own team using reference weights — useful for daily checks but not third-party accredited. Auditors typically require it alongside, not instead of, NABL calibration.
NABL Calibration
Performed by an accredited lab or its authorised on-site engineers — full traceability, stated uncertainty, and accepted across ISO 9001, IATF 16949, GMP and export audits.
Compliance badges shown on page
Why Choose Gramton
Twenty-five years of getting measurement right — what that looks like in practice.
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25+ Years Experience
Deep field experience across weighbridges, batching systems and precision balances.
Expert Engineers
Trained, tested and re-certified technicians at component level, not checklist level.
Modern Equipment
Traceable reference weights and test rigs, maintained to their own calibration schedule.
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Pan India Support
An engineer network that reaches your plant, wherever it is.
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Quick Turnaround
Most on-site calibrations are completed and certified the same day.
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Audit-Ready Certificates
Formatted exactly the way QA and ISO auditors expect to see them.
Experienced Technical Team
A bench of mechanical, electronic and software specialists.
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Competitive Pricing
Transparent quotations, no hidden charges, priced for long-term partnership.
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Customer Satisfaction
A track record of plants renewing their calibration contract year after year.
Our Calibration Services
From a single tabletop balance to a multi-axle weighbridge — every category below is calibrated on-site or in-lab.
01
Weighbridge Calibration
Multi-load-cell verification for road & rail weighbridges.
02
Platform Scale Calibration
Floor and pit-mounted scales across capacities.
03
Bench Scale Calibration
Counter and workstation scales for packing lines.
04
Precision Balance Calibration
Lab-grade balances down to milligram resolution.
05
Jewellery Balance
High-precision carat and gram-level weighing.
06
Crane Scale Calibration
Suspended and hook-mounted scales under load.
07
Tank Weighing System
Load-cell-based tank and vessel systems in situ.
08
Hopper Scale Calibration
Batching and process hoppers for dosing accuracy.
09
Load Cell Calibration
Individual output and linearity verification.
10
Standard Weight Calibration
Reference test weights recalibrated to masters.
11
Calibration Weight Supply
Certified test weight sets for internal checks.
12
On-Site Calibration
Engineers deployed to your facility, zero transport downtime.
13
Laboratory Calibration
Controlled-environment calibration where needed.
Industries We Serve
Accuracy matters differently in every sector — calibrated to the standard each one requires.
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Automobile
Pharmaceutical
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Chemical
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Food
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FMCG
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Packaging
Steel
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Cement
Engineering
Power
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Warehouse
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Logistics
Ports
Textile
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Research Labs
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Government
Hospitals
Education
Our Calibration Process
A consistent, documented sequence — every time, for every instrument.
1
Inspection
2
Cleaning
3
Performance Testing
4
Calibration
5
Adjustment (if required)
6
Documentation
7
Certificate Generation
8
Customer Handover
Benefits of NABL Calibration
What a properly calibrated instrument actually earns your plant.
Improved Accuracy
Instruments read closer to true value, batch after batch.
Reduced Rejections
Fewer out-of-spec batches from measurement drift.
ISO Compliance
Records satisfy ISO 9001 and sector-specific QMS clauses.
Audit Ready
Certificates filed exactly the way auditors expect.
Traceability
A documented chain back to national standards.
Improved Product Quality
Consistent dosing improves finished-product consistency.
Reduced Downtime
Early detection prevents unplanned line stoppages.
Legal Compliance
Supports obligations under trade & quality regulations.
Customer Confidence
Buyers and auditors trust accredited-backed numbers.
Why Regular Calibration Matters
A single calibration is a snapshot. A schedule is what keeps that snapshot accurate all year.
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Accuracy
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Safety
Cost Saving
Preventive Maintenance
Reliable Measurements
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Quality Assurance
Frequently Asked Questions
Have questions about our weighing solutions? Find clear answers to the most common queries regarding our products, accuracy, installation, maintenance, warranty, and support services to help you make an informed decision.
How often should calibration be done?
Every 6–12 months for most instruments; quarterly for high-usage or safety-critical equipment.
What is NABL?
India's accreditation body for testing & calibration labs, under the Quality Council of India.
Is on-site calibration possible?
Yes — most work is done at your facility with portable, traceable reference weights.
Do you provide certificates?
Every calibration includes a formal certificate with readings, deviation and uncertainty.
What is measurement uncertainty?
The quantified margin around a measured value within which the true value lies.
How do I book a calibration visit?
Use the on-page form, call, or WhatsApp — confirmed within one business day.
Trust Stats & Final Call to Action
25+
Years Experience
5000+
Customers Served
1,00,000+
Equipment Calibrated
Pan India
Service Coverage
Rapid
Response Time
NEED NABL CALIBRATION?
Get an engineer visit confirmed within one business day.
Tell us your instrument type, capacity and location — our team confirms a visit and quotation fast.