YES Environment Technologies Inc. was founded in 1987 as Young Environmental Systems and has been developing and manufacturing indoor air quality instruments and related products ever since. YES has established itself as an industry leader and innovator in the Indoor Air Quality (IAQ) market. YES was the first company in the world to manufacture a miniature electronic recording IAQ monitor. The YES brand name is well established and accepted around the world and is synonymous with quality products, competitive pricing and excellent service.

After three years of intense product development, YES launched the new family of second-generation IAQ instruments to replace the older and very successful flag-ship YES-205 instruments. The YESAIR and the YES Plus provide features and functionally that is unique in the IAQ market and has once again set a new product standard for competitors to aim for. The YESAIR provides such unique features as information logging to an SD flash card with tremendous capacity, camera tripod mounting, cable lock system, huge range of true plug & play sensors, to name a few. The YES Plus provides monitoring for up to twelve internal sensors, long battery operation, large capacity built-in data logging. These instruments are smaller, provide more functionality and all at competitive prices.

Early 2007 marked the merging of YES Environment Technologies Inc. with it's larger sister company Critical Environment Technologies Canada Inc. (CETCI) (www.critical-environment.com). This company operates under the name Critical Environment Technologies Canada Inc. The merger allows for more resources to invest into product development, marketing and service. YES and CETCI products are sold through a network of authorized distributors.