Validation testing of corrosion prevention system operation for buried metallic structures has long been understood as critical for quantifying asset condition and avoiding the negative societal and financial impact of infrastructure failure. Additionally, a greater level of public and regulator interest in the results of those inspections is driving a shift in focus towards ensuring technical efficacy and evidence-based validation of field gathered data. In response, Corrosion Service has developed a range of products that are built around raising standards of field-based inspections and providing a greater level of detail and accuracy in the field. An important tool in this range of products is the Portable Transformer Rectifier Unit, which expands the conditions under which testing can be performed.