You haven't mentioned what TDS meter you're considering, but I'd suggest the dual in-line style so as to measure Tap and RO water results.
I actually bought a second meter (single style) so as to measure DI results as well, but that's me being lazy and not wanting to move the meter around.

Similar to the poll I posted earlier today. Ha ha.

Not the only one wondering !

Your poll was part of the reason I asked. I don't dose anything ATM and run a simple system. I guess as the tank evolves will see where it goes, but for now, no reactors or zeo and want to keep it simple. I only bought my ro a few months ago and love having one, much easier than weekly trips to the water store....lol. Sump is finally filling and started adding salt.

I started on store bought ro, but quickly gave up and moved to tap. I have been battling all kinds of algae and nutrient problems, recently switched to ro/di. I can not blame my problems on the water as i was a noob and made lots of mistakes, I can not fully give my tank looking better lately to the switch to rodi, as i have a better idea what i am doing now, and spend a little more time tweaking this chemistry set that is my reef tank.

I use ro/di in my freshwater as well the tds meter reads well over the 200 mark in Edmonton.

In 2009 70% of poll respondents on this site said that they used RO water. However DI was not an option on that poll. It will be interesting to see if that has changed much.
RO/or no RO
http://www.canreef.com/vbulletin/sho...hlight=ro%2Fdi

I use RO/DI because it eliminated the source water variable. That way if I have something go wrong in my tank I can say: "well my lighting is still the same, my water is pure, the temperature is stable etc... so what have I done or added lately that could have caused this?" It makes problem solving much easier.

Water here in Chilliwack is awesome..so tap water in my top up resevoir is all.

I used to use tap. Now RO/DI only.