Since 1882, Weiss Instruments has made temperature and pressure instruments and controls, building its name around industrial thermometers and pressure gauges. The company’s history began with Albert A. Weiss Jr. manufacturing glass thermometers with his father after World War I, and its third and fourth generations later carried the business through Long Island before manufacturing moved to Mount Clemens, Michigan, in 2022. Weiss also develops customized instruments for OEM applications, including its patented self-powered Vari-angle digital thermometers and light-powered pressure gauges.
NSF Approval Listing
UL Certification in the United States of America
UL Certification in accordance with NSF/ANSI 372
NSF/ANSI 372
NSF/ANSI 61
ASME B40.1 Grade 2A
ASME B40.1 Grade 1A
ASME B40.2
ASME B40.3-1990
ASME B40.7 Conformance
California Proposition 65
Compliance program
Conflict Minerals Compliance
Compliance program
UL Certificate of Compliance for Lead Free Products
NSF
Quality certification
UL
Quality certification
DwyerOmegaDwyerOmega brings together measurement brands with roots reaching back to Weiss, established in 1882, and a combined history spanning more than 950 years. The Michigan City, Indiana-based company serves industrial and controlled-environment customers worldwide, with 26 manufacturing and engineering facilities across 18 countries and more than 3,000 employees.SUNBURY, OH
Kessler Thermometer and Chase InstrumentFamily-owned and operated since 1934, Kessler Thermometer and Chase Instrument manufactures precision thermometers and hydrometers in West Babylon, New York. The company is one of the last U.S. manufacturers in this field and developed its mercury-free SafetyBLUE line for applications where mercury is prohibited. Its 8,000-square-foot facility includes an ISO-accredited calibration laboratory that certifies instruments and provides NIST-traceable reports.WEST BABYLON, NY
Tel-Tru Manufacturing CompanyFamily-owned since its 1916 founding in Rochester, Tel-Tru Manufacturing Company remains under the ownership of third-generation descendant Andy Germanow. The American manufacturer is known for temperature instruments built for demanding industrial and sanitary applications, with more than a century of experience supporting customers through custom-engineered solutions.ROCHESTER, NY
Meriam Process TechnologiesStarted by Joseph Meriam with his wife and children as the workforce in a 1911 garage operation, Meriam Process Technologies manufactures pressure and flow measurement instrumentation along with test and calibration equipment. The company’s original U-tube manometers grew into a broad process-measurement business, including digital manometers and its MFC5150 HART communicator, which reads device descriptions without translations or subscriptions. Meriam is now a Western Enterprises company and remains part of the Scott Fetzer Company heritage described in its history.CLEVELAND, OH