GISCO — Geophysical Instruments & Supply Company was started by Al Danish in April 1952 in Denver, Colorado. Over the years, GISCO expanded its product line and established a worldwide reputation as a single-stop source for almost any geophysical instrument and geological field or lab instrument.

GISCO now specializes in sensitive, professional grade instruments for civil engineering, oil, mineral and ground water exploration. GISCO also serves engineering geologists, hydrologists, paleontologists and meteorologists. GISCO personnel provide the industry's best expertise from a mix of geophysical, engineering and scientific backgrounds.

Our product knowledge and close working relationship with many manufacturers was developed to meet the needs of professional, academic and government communities. With our technical experience we provide a capability of integration of instruments and technologies. GISCO prides itself in being able to design and develop instruments for specific situations. Finding answers to questions has been a key to our success.

GISCO also offers service and replacement parts for a wide variety of instruments. We can repair or upgrade most geophysical instruments. We can also supply connectors, chart paper, batteries, and many other parts you may need for obsolete, discontinued, and orphaned instruments. If we do not have it we will find it for you. If we can not find it we may be able to make it!