Electric-car start-up Tesla Motors (NASDAQ:TSLA) is on the verge of its first profit, a huge milestone for the audacious Silicon Valley start-up. But plenty of potential pitfalls remain. In this video, Fool contributor John Rosevear outlines three things that any Tesla investor should be watching carefully and that any potential Tesla investor should take into account before buying.

Fool contributor John Rosevear owns shares of Ford. Follow him on Twitter at @jrosevear. The Motley Fool recommends and owns shares of Ford and Tesla Motors . Try any of our Foolish newsletter services free for 30 days. We Fools may not all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. The Motley Fool has a disclosure policy.