What tech essentials do you think are must-haves for engineering students, and what can they skip?

As engineering students start their academic journey, they're often faced with the dilemma of deciding what technology they really need. What are some of the most useful tech purchases you've made as an engineering student, and are there any that you regret or think are overhyped? We'd love to hear about your experiences and get your advice on what's worth investing in.