ALT is an independent acoustic and vibration laboratory in Bangkok. We calibrate instruments, test materials and products, and verify whether performance claims hold up. We do not sell, design or supply the things we measure.
What do you need?
Calibrate an instrument
Sound level meters, microphones, calibrators, dosimeters, accelerometers.
Test a material
Absorption, transmission loss, impact sound, impedance tube, airflow resistance.
Test a product
Sound power for machinery and appliances, loudspeakers and audio equipment.
Develop a prototype
Baseline, A/B/C comparison and design-change verification through a development cycle.
Verify a performance claim
Independent evidence for tenders, imports, supplier specifications and disputes.
Investigate vibration or structural behaviour
Frequency response functions, natural frequencies, resonance and damping.
Why ALT
AI can model a room, run the calculation and write the report. It cannot put your sample in the chamber. As specifications, simulations and documents become trivially easy to produce, the value of a physical, traceable measurement made by an independent laboratory goes up, not down.
That is the whole of our position. We hold the rooms, the reference standards, the traceability chain and the accreditation — and no commercial interest in the outcome.
Accredited to ISO/IEC 17025:2017
Certificate 24-LB0054, issued by TISI, valid to November 2028. The scope document is published in full — download it.
A real physical laboratory
Reverberation rooms, anechoic chamber, impedance tubes, calibration benches — in Bangkok.
Independent by construction
We test it. We do not sell it, design it or supply it.
ISO and ASTM, side by side
Your buyer specifies one or the other. We report to either.
Tell us what to send
Specimen sizes, mounting conditions and packing published up front.
We check our own installation
Every sound insulation specimen is scanned with an acoustic camera before we measure, so the number reflects your product and not our aperture seal.
Bangkok is closer than Singapore
Shipping a 10 m² specimen from Manila or Jakarta to Bangkok is faster and cheaper than to Singapore, the EU or the US.
Accredited, or traceable — we always say which
Our accreditation covers three calibration services, not everything this laboratory can do — and a laboratory that implies otherwise is overstating. Every service page here carries a badge saying which it is, and the full accredited scope with its measurement capability is published on one page.