Eping Electro-Optic Instruments
Chinese manufacturer and supplier of auto levels,lasers,tripods,staffs,poles,measuring tapes and surveying instruments.
http://www.surveyingtrade.com/

Bauer Associates
Designs and manufactures state-of-the-art electro-optical instruments.
http://www.bauerinc.com/

Conex Electro Systems
Manufactures digital barometers and thermometers and other weather instruments.
http://www.conex-electro.com/

Taylor Hobson
Taylor Hobson Precision - Metrology, the science of measurement; science or system of weights and measures. Parameters can be separated into three basic types: Amplitude parameters, Spacing parameters and Hybrid parameters. The purpose of a parameter is to apply a number that can characterise and hence remove the need for somebody’s subjective assessment of the surface texture.
http://www.taylor-hobson.com/

Coherent, Inc.
Founded in 1966, Coherent, Inc. is a world leader in providing superior laser reliability and performance. Coherent provides laser-based solutions, laser measurement instruments, and optical components to a broad base of commercial and scientific research customers.
http://www.coherentinc.com/

Constellation Technology Corporation
analytical instruments, instruments, scientific instruments, nuclear instruments, radiation detection, multichannel analyzer, spectrometers,
http://www.contech.com/

Engineering Measurements Company
EMCO Flow Systems knows flow. With over 35 years of flowmetering and application experience, EMCO has the right technology to fit your liquid, gas and steam flow measurement needs.
http://www.emcoflow.com/

The Electro-Optics Foundry
Provides contract manufacturing services for electro-optic and vacuum microelectronic devices.
http://eofoundry.com/

Zygo Corporation
ZYGO's high-precision noncontact metrology systems use optical interferometry to measure displacement, surface figure, and optical wavefront for yield improvement initiatives in the flat panel display, semiconductor, and industrial markets.
http://www.zygo.com/

Electro Enterprises
Mil-spec connectors and components for military aerospace and general aviation - Military connectors, relays, switches, circuit breakers.
http://www.electroenterprises.com/