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TDS Meters

I have both a portable and inline one. I like the inline one since it's so easy to turn it on an see the TDS at pre DI and post DI. I got mine from airwaterice.com.
 
I went with the 'cheap' one that cost around $25 or so. They must've come out with a newer version for $29 which looks even better than mine. http://www.airwaterice.com/product/SENNODUALTDSMETER/Dual_TDS_Meter_Senno.html
There's no need for the industrial one, you can always call and talk to them about it, I've had excellent customer service from them and have bought their equipment/ filters before.
 
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