Following measuring instruments are being used for survey and alignment:

• Angle measurement: Precision digital theodolites Leica TDA5005, TDM5000 and TM5100. For Indus-1 we used KERN E2 theodolites and TDM5000.
• Distance measurement: Distinvar® with calibrated invar wire, Laser Interferometer as distance standard, Total station TDA5005 and TDM5000.
• Levelling and elevation: Wild N-3 optical level.
• Tilt: Electronic Inclinometers Leica Nivel-20, Wyler precision spirit levels.
• Softwares: SNAAPS(in-house developed) - For survey data collection, their least square adjustment, on-line coordinate measurements, alignment error analysis, curve fittings, coordinate transformations, stake out, resection etc. Axyz™ - for online coordinate measurements and analysis.