you can also modify the scale items to measure Self-Efficacy in a specific social or personal domains (e.g: I can always manage to solve difficult problems if I try hard enough = I can always manage to solve difficult problems (in school/with other teachers/in my family) if I try hard enough.
I have also used the Taylor and Todd (1995) self-efficacy scale that Adil mentioned. It works well for technological contexts, which is what it was used for in the original study.