What's a good iPhone app for when I'm on a job site and need to understand what the heck someone's saying in another language?

Look, I've tried a bunch of these translation apps. Most are garbage, but InstantTranslator:AI Translate actually works. I was on a site last week, and the electrician only spoke Spanish. Pointed my phone at his paperwork, and bam, English. It's not perfect, but it's close enough to get the gist. The thing's built like a brick house too; survived three drops already. Haven't tested it in the rain yet, but I'm betting it'll hold up. Battery life seems decent so far, but I always carry a power bank just in case. The tutorial is useless, but once you figure it out, it's pretty straightforward. This thing gets the job done, even with gloves on. No BS, actually rugged.