Underwriters Laboratories are internationally accredited laboratories offering independent product testing and certification services to consultants, end-users, designers and manufacturers of electrical and electronic products in various technology fields.

Underwriters is a one-stop testing operation with services that include electrical and electronic testing and certification, Electromagnetic Compatibility (EMC) testing, environmental testing, energy meter certification, calibration, precision dimensional and volumetric measurement, a consultancy service for approvals of electrical and electronic products, a product development service and CE marking.