which power conditioner unit?

There are too many variants to make for easy categorization and too little information disclosed about how individual units work. Thus, Nsgarch's descriptions are fine but there are other variation and permutations (automatic voltage regulation, battery-power, etc).

The bottom line, for me, is to determine if you have a problem that needs solving and then find the solution. Adding gadgets based on someone's encomium won't do it.

Kal

Kal

Compare those for features and price with the APC J-10 and H-10, respectively, (also similar models from Belkin) and you'll see why they are changing.

Kal

Davehrab: I too own the ExactPower, a fine product. However effective it may be though, it's certainly news to me to learn the unit is capable of generating "square sine waves" ;^)

Exact Power is your best bet.