Calibration certificate issued by JASH is traceable to either National and/or International Standard. Facilities, which JASH owns for the purpose:
Laser Interferometer with full set of laser optic for measurement of linearity, straightness, flatness and squareness
Mitutoyo, Japan make Step Gauge
Wyler, Swiss make, Precision Electronic Digital Minilevel -2, Sensitivity 0.01/ 0.001 mm / meter
Rank Taylor Hobson, U.K. make, Automatic Position sensing, Photo-Electric Auto Collimator with Measurement optics for straightness, flatness and squareness, Resolution 0.1 arc sec.
CARL ZEISS JENA German make, Precision Co-incedence level, sensitivity 0.01 mm / meter
Hilger & Watts, U. K. make, Precision Block Level model TB4-2, Resolution 0.1 mm /meter
Baker-Pretec make, Digital LVDT Probes with Analogue & Digital meters
Apart from the above list, there are many other instruments and mechanical artefacts which are being used for calibration purpose.