Methods and apparatus for generating a searchable electronic record of a locate operation in which a presence or an absence of at least one underground facility within a dig area may be identified using one or more physical locate marks. In some embodiments, the system includes a first circuit having first pump for circulating a first medium therein, a second circuit having a second pump for circulating a second medium therein and a thermoelectric module having a first surface in thermal contact with the first medium and a second surface in thermal contact with the second medium. Each tool is laser machined from stock no larger than 1.