Calibration instruments, dry-block temperature calibrators, pressure-calibrator kits, and digital pressure gauges, are manufactured by R&D Instrument Services for manufacturing, pharmaceutical, and oil-and-gas customers. Founded in 2002 and headquartered in Chennai, its NABL-accredited lab ensures ISO/IEC 17025:2017 compliance, and the company exports to Singapore and other regions, offering onsite calibration services and test benches.