Shielding Integrity Services, (SIS) was founded in 1988. We offer over 75 years of combined staff field experience in performance testing of all types of radio frequency shielding, semi-anechoic and fully anechoic chambers, as well as open area test sites on a worldwide scale. SIS is not affiliated with any chamber manufacturers or contractors. We are a completely independent third party performance evaluator. In 2011 we underwent the rigorous qualification process necessary to become accredited by the National Voluntary Laboratory Accreditation Program (NVLAP). You'll find our full scope of accreditation on our website.