Good translation has a solid command of the syntax and grammar in both source and target languages. Accurate technical translation services has a knack which balances the content with the language-specific norms and culture of the target language. It revolves around attention and care to the details. Good technical translation makes the sentence look like it was authored in the target language.
Professional technical language translators keep their technical jargon and colloquial terms updated. If you can see all these characteristics in a professional, you can get an idea of translation services being accurate.