look at what these folks have , I have ALLWAYS had good luck with their products , not the cheapest but I can PERSONALY recomend them .
http://www.solaheviduty.com/products/index.htm
I work on scales ,a scale ( old school analog ) is like a volt meter that goes out 7-10 decimal places , now put that in a steel mill ( think of those Big towers with power lines , they transmit KVA ( KillaVoltAmps )) or at the end of a long transmittion line AFTER 2 steel mills or just WAY out in BumFuck Egypt ,
Steel mills use HUNDREDS of KVA power per electrode ( 3 generly , but ther are some that use 1 big electrode ( DC ) , this can SERIOUSLY Fuck with the power !!!!!
Sola Isolation trans formers clean up the power about 90+% , and YES TW I have used a power analizer to test this befor .
Sola also has some of the best REAL world surge proctecters and UPSs on the market , NOT cheap but if you are looking for 1 sorce for power conditioning you can do a WHOLE lot worse than Sola .
Just my 2 cents .