I have a number of electrical home appliances that are designed for

- 100V, 50Hz
- 120V, 60Hz
- 230V, 50Hz

I have a converter 100V <=> 220V-240V (according to the description). My power outlet has (supposedly)

- 110V-115V, 60Hz 

and in other places

- 220V, 60Hz.

What effects do I have to expect when I use my appliances (with or without converter, as appropriate), where the appliances are

- (120V/60Hz) stand mixer (simple motor)
- (100V/50Hz) rice polisher (turns for a pre-programmed number of times)
- (100V/50Hz) rice cooker (with complex functions such as indicating time, calculating time remaining for a particular rice cooking program)
- (120V/60Hz) mixer (variable speed)
- (100V/50Hz) CD player
- (230V/50Hz) printer

at the slightly different voltage?

Is it sensible to measure the voltage and frequency before using the appliances and, if so, what equipment do I need?