Marschall Acoustics Group - Provides a wide range of geophysical sensing and measurement instrumentation, including solid towed hydrophone arrays, solid state geophones, and electromagnetic imaging and analysis systems. Icefield Tools Corporation - Manufacturer of digital borehole survey tools for the mining, geotechnical, and oil and gas industry. Nanometrics Seismological Instruments - Manufacturer of broadband seismometers, seismographs, earthquake monitoring and turn-key very small aperture terminal seismic communications systems. Mount Sopris Instruments - Manufacturers of borehole geophysical logging systems for the geological, natural resource, and environmental communities. Delta Epsilon - Manufacturer of portable borehole logging equipment and hand-held scintillometers for groundwater, geotechnical, and radiation surveys. Bartington Instruments - Manufactures fluxgate magnetometers, magnetic field sensors and magnetic susceptibility systems for soils and rocks. Seistronix - Manufactures, leases and sells exploration seismographs and related geophysical equipment for oil, gas, mineral and geotechnical exploration. IRIS Instruments - Manufacturer of equipment for geophysical, geotechnical and environmental in-the-field investigations. Site in English, French, and Spanish. Geonics Limited - Manufacturer of electromagnetic geophysical survey systems. Geometrics Inc. - Manufacturer of geophysical instruments for subsurface investigation. NOMIS Seismographs, Inc. - Manufacturer of seismic monitoring equipment. 3Dgeophysics.com - Sells, rents and services geophysical instrumentation used on environmental, geotechnical and mining projects. ZHinstruments - Designs and manufactures specialized equipment for the measurement of magnetic susceptibility of soils and rocks. Applied Acoustic Engineering - Acoustic positioning, acoustic release, sub bottom profiling and acoustic telemetry equipment for off-shore industries. GEM Systems Advanced Magnetometers - Magnetometers for ground, airborne and stationary applications including mineral exploration, hydrocarbon exploration, archeology, environmental, magnetic observatory and earthquake research. Sercel - Provides seismic acquisition systems based on cable, radio telemetry and vibrators. Includes news, brochures, a catalog of products and services. MALÅ GeoScience - Maker of ground penetrating radar technology for both surface and borehole applications in geophysical, geotechnical and civil engineering fields. Sensors and Software Inc - Ground penetrating radar technology for a variety of applications. Includes products, rentals, maintenance and training. Exploration Electronics - Rental and operation of seismic equipment. Includes a description of available equipment and a company profile. Güralp Systems Limited - Designer and manufacturer of low-noise broadband seismometers, seismic digitizers and networking equipment. Wireless Seismic - Multi-channel wireless seismograph systems for recording 3D seismic surveys without geophone cables. Gisco Geo - Worldwide sales, service, and rental of new and used geophysical instruments and field supplies. Scintrex - Provides sales and service of geophysical instrumentation for ground, borehole, marine and airborne applications. Includes a product catalog, support manuals, technical papers and software applications. Geomatrix Earth Science Ltd. - Sales and rental of new and used exploration geophysical instrumentation. IFG Corporation - Sales, leasing and research and development service of small diameter borehole geophysics equipment and sensors. Kinemetrics, Inc - Earthquake instrumentation products for monitoring bridges, dams, structures, seismic arrays and networks, as well as systems for the nuclear power industry. OYO Geo Space Canada, Inc. - Develops technologies and engineers products used by the oil and gas industry to acquire geophysical data. Products include sensors, cables, connectors, marine streamer retrieval devices and peripherals, which are used in the acquisition of seismic data. Phoenix Geophysics - Geophysical manufacturing and contracting company offering magnetotelluric (MT) and induced polarization (IP) instrumentation. RMS Instruments - Specializes in research, development and production of ruggedized data recording equipment, test and measurement instruments, and geophysical exploration systems. ZLS corporation - Designs and builds high precision gravity meters with zero-length spring. Also includes an electronics lab with repair services and test facilities. Bolt Technology Corporation - Designer and manufacturer of air gun and impulse generating devices as seismic energy sources. The product line targets mainly marine applications. R.T. Clark Companies, Inc. - An international brokerage company offering new, used and surplus equipment for land, marine, and airborne geophysical and geotechnical applications. Geotech - Based in Moscow, offers geophysical equipment and surveys including ground penetrating radar, electromagnetic, seismic stations and recorders. Radar Systems, Inc. - Based in Latvia, manufactures equipment for ground penetrating radar. ABEM - Manufacturer of geophysical and vibration monitoring instruments. Includes technical papers and resistivity software. KD Jones Instrument Corporation - Specializes in geophysical instruments rental services for engineering and environmental companies. GeoSIG Ltd. - Manufacturer of instruments for early earthquake detection, seismic recorders and structural monitoring systems. Geoscanners - Manufacturer of ground penetrating radar technology. Specialty equipment and related instrumentation for deep geophysical surveys. Site available in English, Spanish, Swedish and Russian. Landviser - Designs and manufactures specialized instruments for the measurement of electrical resistivity of soils and rocks. ZZ Resistivity Imaging - Specializes in electrical resistivity imaging instruments and services. Provides data acquisition, processing and inversion systems for crosshole tomography and surface resistivity surveys. Avalon Sciences Ltd (ASL) - Designs and manufactures advanced borehole seismic recording systems. Includes a description of the systems and manufacturing methods. EMIT - Manufacturer of instruments and software for electromagnetic imaging. Produces an advanced tri-axial borehole fluxgate magnetometer. Metrozet - Developer of seismic products for use in academic research, tsunami warning centers, nuclear test monitoring networks, oil and gas enterprises, and structural monitoring systems. Advanced Logic Technology - Design and production of slimhole imaging probes, acoustic and optical televiewer, data logging systems and geophysical borehole logging equipment. Macha International - Designs and manufactures seismic source control instrumentation and test equipment. Provides corporate information, details of products and information on rental and repair. Pico Envirotec Inc. - Advanced instrumentation and turnkey systems for use in airborne and ground geophysical surveys for mining, oil and gas and environmental applications. Electromind - Design and manufacturing of borehole geophysics instruments. Several models of optical and acoustic borehole imaging probes together with a universal data logger for all the probes. Beijing Earth Long Science & Technology Co.,Ltd - Manufacturer and supplier of geophysical instruments. Includes a company profile, details of the products and the network of distributors. LNS Geophysical Equipment Rental - Rental of geophysical equipment for shallow marine environment and land surveys. The company also offers rentals of utility detection equipment.