This report describes a two-phase effort that went into developing environmental test criteria for general mine instrumentation. Phase I consisted of research and mine visits to develop an environmental profile for mine instrumentation that was translated into general and test requirements. A review of existing government and commercial specifications was performed to determine if they matched the test requirements. Finally, a set of environmental test procedures was developed to test mine instrumentation. Phase II consisted of selecting and purchasing sample mine instrumentation and subjecting them to the previously developed tests to evaluate the criteria for use as an instrumentation test document and to determine the effects of the various criteria on a representative sample of both proven and new developed instrumentation. The test criteria were then modified, based on test results, and are included in the report.