

Been going down a rabbit hole trying to shortlist a data logger vendor for a pharma/cold chain application, and wanted to share what I found in case it saves someone else the research time.

Turns out a lot of manufacturers advertise "compliance" but don't actually have all three of the things that matter for an audit: in-house NABL calibration, WHO/PQS listing, and proper 21 CFR Part 11 compliant software. Miss any one of those and you're looking at real headaches later, some people I talked to went with imported brands that looked good on paper but had zero local service support, and ended up waiting 3-6 weeks just to get a unit recalibrated.

I put together a comparison of how some of the bigger Indian names stack up (Tempsen, Elpro, Masibus, Yokogawa, and a few others) on calibration turnaround, actual compliance depth, and vaccine cold chain listing specifically, since that's usually where the real gaps show up.

If anyone's dealing with something similar, wrote up the full comparison here: [Top 10 Indian Data Logger Manufacturers in 2026](https://www.gtek-india.com/indian-data-logger-manufacturers/) — happy to discuss in comments too if people have their own experiences with any of these brands.

*(Disclosure: I work with G-Tek India, one of the manufacturers mentioned, so take that into account when reading.)*

Comparing Indian data logger manufacturers for a pharma cold chain project — here's what I learned