Precompetitive technology (PT) refers to devices, equipment, software or processes primarily developed at universities in developing countries for research or teaching as a result of externally financed projects contracted between the university institutes, centers or faculties and industry. PT is generally embodied in the form of laboratory prototypes and is licensed via technology transfer (TT) contracts between the university and external funding agencies or other interested parties. In the process of defining the terms of a TT contract, a fundamental question arises: what is the monetary value of a precompetitive technology? In this paper we present a methodology for PT valuation based on the identification of specific value points (SVP) related to its development. The four-step method includes the definition of a PT value range based on cost and market approaches, expected incomes, present value and scoring in order to determine the relative weights of the primary aspects of the intellectual capital behind the technology. The valuation methodology is applied to the specific example of a scanning probe microscope (SPM) developed at the Centro de Ciencias Aplicadas y Desarrollo Tecnológico of the Universidad Nacional Autónoma de México (UNAM).