Login or register (free and only takes a few minutes) to participate in this question.
You will also have access to many other tools and opportunities designed for those who have language-related jobs (or are passionate about them). Participation is free and the site has a strict confidentiality policy.
Explanation: Here's what I was able to find, maybe it'll be of help, if not for this job, for another.
sonda de toma de testigo » sampling probe
lámpara testigo » pilot lamp, warning lamp
hilo testigo » pilot wire
funda de testigo » core shell
extracción de testigos » coring
2 testigo m
a (en carreras de relevos) baton
b (en experimentos) control
c (mojón) marker
d (luz) warning light, indicator light