Also going to add the ones I bought on amazon that didn't work were much thicker than the contec ones, the connector did work though, but I think the thickness of the space in the tubing may need to be the same perhaps to work, and the contec ones are very narrow. Thicker ones are probably for oxygen delivery and other uses and not co2 reading.

It can seem real time, but if I do an experiment such as breath hold or other big breathing change and wait till I see it, it's about 5 seconds from memory.

For the water I use these types of tubes: https://contechealth.com/collections/hot-sales/products/tube-adapter-for-co2-module-etco2-capnograph-respiratory-cable-for-cms8000-vet-veterinary?_pos=3&_sid=3eab643da&_ss=r

They remove the water, using that gold color threaded thingy in the tube it attracts the water vapor and releases it out of the tube, but not perfectly, when I stop if there is still water in the tube -- which is very often especially if used in the Winter with low humidity, I leave the machine running without me being plugged into it from 5-30 minutes depending on how much water was in the tube to help clear it because without the airflow it won't clear out.

I also figured out you can reuse the water filters by just ripping the ends off the tube they are just forced onto a tight connection. Then you can have cheaper cannulas without it and cut a spot on those and force it back on. It works better than expected because water filters are not permanently attached its just by tightness of the connection. Then if you throw out a cannula for sanitary reasons you can just take out the water filter and use it with another new one, I also experimented with attaching two of them on one cannula to make the filter even more powerful and it seems to work without messing up the readings as far as I can tell. Not sure if it actually works better, but I use it that way now.

If you end up buying it and the cannulas to get the best price look on that site, ebay, and aliexpress and buy whatever has the best price. I can also probably sell you some tubes with and without filters if you want them for really low cost way below what they sell them at because I bought way too many, though they are probably close to expired based upon the date they put on them -- can tell you the exact date if you want to know.

I only used the ones from contec and looked for other options but it was hard figuring out which would fit and eventually gave up on trying to find cheaper ones, other than if you can find a page that sells them in larger quantities they then end up less per unit. Also the ones from contec are no smells at all, I did buy some on amazon that I thought could work and they didn't plus they smelled really bad because the type of plastic. So the contec ones are at least of good quality material 

From my unit I can only get the graph to do co2 and nothing else, maybe some marketing person made graphics that aren't accurate, because I do recall seeing that image too, but didn't know what it was of and assumed it was co2. But the actual unit has no way of making a graph of the spo2 as far as I can tell, certainly not mentioned in the manual that you can. It just does the spo2 % number like shown on the screen.

I'm familiar with the CapnoTrainer there are lots of good videos out there describing what they do in detail many created by the founder I think. They are what convinced me that I probably have a problem that is unique enough that it's probably not wise to pay for their expensive service. Could have sworn it was around $2k for rental for like a month and a person helping you for a few hours because the rate for the person is around $250 an hour and contributes more to the cost than the rental. I can change the way I breath in various ways, but it makes things worse because my nervous system seems to force itself back into the old pattern and that process is always brutal on my body as it gets much worse as it finds it way back to the old way. 

I had a couple instances that suggest what is stuck in my body is very much like trauma energy. I found by accident various ways to manipulate my breath that the later had the effect when I laid down it would feel like the energy from the tension in my abdomen was slowly moving to my arms, legs, and jaw/face over several minutes to 30+ minutes. I'd end up buzzzing with intense energy and feel locked down in those areas at the same time. It would feel like what I've experienced if in a life threatening situation and the body mounted intense energy to defend itself and then at the same time froze because it realized it was too dangerous to fight. If the energy can pass through my body then the symptoms will probably stop. Haven't been able to figure out how to get it to happen, if I move especially early on when the energy just starts moving it hides again.

Not sure if I get what you are saying clearly, you already had rented one? and are going to do it again? 

The contec does show the waveform, it's just on a tiny screen so not the most detailed. 

Talking is really bad too for me. If I talk for a sentence or less, let myself breathe a few breaths while not moving, then resume talking and keep pausing for a while after talking only a bit that helps a lot. For moving I adopted a similar tactic in that if I only move for a few seconds and then stop moving to breathing 1-2 breathes with no movement it stops the crazy breathing acceleration and tensing from happening. Doesn't solve it, but makes the bad effects much less.

I also had a lot of trouble eating, and was able to resolve that by very carefully watching my breathing patterns while eating, and figuring out how to modify them to be what would make sense to me as normal. I don't recall the details clearly, but I think I was not stopping during the eating process to breathe through my nose and maybe holding my breath for a long time and then going into faster breathing to compensate afterwards.

I too heard about the CaponoTrainer, and looked into someone renting me it and doing training with it, but I reasoned that whatever I had was highly atypical and there was a good chance there short very expensive training and rental would just leave me with a lot less money, and that was part of how I ended up buying that machine. 

Too much is bad, too little is bad, it has a number of important functions, so that poisonous bit is a huge oversimplification that gets repeated a lot, but is clearly incorrect if you need some to be alive.