U.S. EPA ETV Program Disclaimer Information on the performance characteristics of YSI sensor technology can be found at www.epa.gov/etv, or call YSI Environmental Technical Support at 800.897.4151, or email environmental@ysi.com for a copy of the ETV verification report. Use of the ETV Name or Logo does not imply approval or certification of this product nor does it make any explicit or implied warranties or guarantees as to product performance.