NABL Accredited · Dimensional Calibration
Taper Scale Calibration
(IS 1717 — Taper Gauge Calibration)
NABL-accredited calibration of taper scales (wedge gauges) per IS 1717 — verifying taper angle, scale graduations and linearity for crack width and gap measurement in construction structural inspection.
IS 1717
Standard
±0.05mm
Accuracy
1 Day
Report TAT
NABL
Accredited
NABL Accredited Lab · ISO/IEC 17025:2017
Digital Reports via Autovity QLMS
Pan-India · 7 Lab Locations
Est. 2009 · 20,000+ Projects
Overview
What is the Taper Scale Calibration?
Taper Scales (wedge gauges) are tapered blades graduated in mm increments used to measure crack widths, joint gaps and surface openings. In construction testing used for concrete crack width measurement and expansion joint gap checking. IS 1717 specifies graduation accuracy.
At Global Lab, taper scale calibration per IS 1717 verifies actual thickness at each graduation mark using calibrated outside micrometer — checking linearity of the taper. Scale reading accuracy and taper linearity reported on the NABL certificate.
Non-Destructive
Minimal surface preparation. Structure integrity is preserved throughout testing.
Fast Turnaround
On-site results within hours. Digital reports dispatched within 24 hours.
NABL Certified
All test and calibration results are backed by traceable measurements and standardized procedures.
Pan-India Coverage
Site engineers deployed across 7 lab locations and all major project sites.
Digital Reporting
Access reports anytime via Autovity QLMS client dashboard — zero paperwork.
High Accuracy
Results correlated to cube compressive strength with ±2% precision range.
Test in Action
Taper Scale Calibration — Site Images
Taper Scale Thickness at Each Graduation — Calibrated Micrometer
Taper Linearity from Best-Fit Line
IS 1717 NABL Certificate — Scale Graduation Accuracy
Test Procedure
How the Taper Scale Calibration is Conducted
-
1
Surface Preparation
A shallow groove (approx. 25mm deep) is cut into the concrete surface using a diamond-tipped cutting tool. The surface is cleaned of dust and debris. -
2
Insert Disc Placement
A specially designed steel insert disc is placed into the groove. A thin rod connects the disc to the pullout apparatus above the surface. -
3
Hydraulic Pullout Force Application
A hydraulic jack applies a steady, controlled pullout force to the insert disc via the reaction ring resting on the concrete surface. -
4
Failure Load Recording
The maximum force at which the concrete cone is extracted is recorded. A digital load indicator provides real-time readings with data logging. -
5
Strength Calculation & Reporting
The pullout force is correlated to cube compressive strength using established calibration curves. NABL-accredited reports are issued via Autovity QLMS.
Standards & Specifications
Applicable Test Standards
| Standard | Title | Scope | Type |
|---|---|---|---|
| IS 1717 | Taper Gauges — Specification | Taper Gauge | Indian Standard |
| IS 1832 | Outside Micrometers | Reference Instrument | Indian Standard |
| IS 2984 | Gauge Blocks | Reference Standard | Indian Standard |
| NABL-141 | NABL Policy on Metrological Traceability | Traceability | NABL |
Applications
Where is the Taper Scale Calibration Used?
Structural crack width monitoring taper scale calibration
Concrete crack survey gauge calibration for infrastructure
Expansion joint gap taper gauge calibration
Pre-stressed concrete joint taper gauge calibration
Annual taper scale calibration for construction lab
Forensic structural investigation crack width calibration
Why Choose Global Lab
Our Advantages
NABL Accredited CertificatesIS 1717 certificates for NDT and structural inspection.
Linearity VerifiedNon-linear tapers identified — prevents systematic crack width errors.
Fast 1-Day CertificateCertificate within 1 working day.
Pan-India CoverageDimensional calibration at all 7 locations.
NDT Instrument PackageTaper scale + Vernier + dial gauge for NDT lab.
Crack Monitoring IntegrationCalibrated taper scale used with crack monitoring service.