Within the Department of Energy national laboratory system, the Geosciences Measurement Facility is singularly capable of designing, building, testing, and deploying customized Earth and environmental science instrumentation. For more than four decades, GMF engineers, scientists, and machinists have partnered with hundreds of researchers at Berkeley Lab and worldwide to develop advanced instrumentation, laboratory- and field-based sensing systems, and lab-to-field data measurement and telemetry solutions. These tools have been critical to addressing scientific questions and challenges surrounding ecosystem health; watershed function; atmospheric systems; carbon sequestration; agriculture and bioenergy; oil, gas and geothermal resources; ocean behavior; and hazardous material storage and disposal. GMF instrumentation solutions have repeatedly enabled new scientific discoveries that might otherwise have remained out of reach using standard off-the-shelf measurement solutions.