For most appliances, here is a general rule.

1. If the device has an AC motor, it may have an issue with the frequency.

- Mixer, Washer/dryer, fan blower etc.. might have an issue

2. Most modern electronics without moving parts (with exceptions)
.. TV, Stereo, DVD player, computer, monitor etc are less likely to
have a problem.
These things may have moving parts, but usually they are DC
powered.

Obviously there are exceptions and other factors involved, but this
should do it.

For TVs etc, you may want to check the tuner for local standards.
NTSC/PAL etc.. (most new/HD sets work with almost every standards)