content: If you think there's some magic and you're getting a precision digital caliper for $9, think again. This is a steel ruler that happens to have a digital readout. I guess the precision would be enough for some applications (e.g., wood carpentry) but I would not recommend it for precision mechanical or electronic applications. In particular, the depth gauge feeler on mine was slightly bowed and did not fit precisely in the guides for it, making accurate measurements with it impossible. Lesson learned, I'm coughing up $85