How To Check/Measure Bike Chain Wear/Stretch

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1. I don't think that the numbers are in MM.  It means .75% stretch and 1% stretch.
2. Stumbled across this video while looking up reviews on the CC-3, as my CC-2 got damaged (accidentally dropped it and pin bent, so now it is all out of calibration).
   
   Not sure if I should get this or go for the ProGold checker.  Supposedly the ProGold one has ability to 'calibrate' it to your new chain (gently bending it on a flat surface as not to distort it), which eliminates minuscule variations between chains, but I'm not sure how you can actually calibrate it as it starts at .5mm wear.  
   
   The third option is just use my digital caliper (measure with 9-links in between).  That seems like it'd be even more accurate than any of these gauges.  And if I write down the measurement when the chain is brand new, I can just reference the difference every so often when I check it.
3. I always replace a chain and cassette at the same time. Chain ring is usually good for a year and a half. I find that only 2 rings on the cassette tend to wear out as they are the ones I do most of my riding with. I tried a new chain on a used cassette and had nothing but problems, plus a new chain on a partially worn cassette will just cause premature wear on that new chain.
4. How many new chain swaps will the same cassette last? I have a chain checker, but It tells me I need a new chain ($40) every two months. So I just run the same chain until the cassette is dead (about 1.5 years), it's much cheaper than replacing chains. 
5. Being somebody who is just beginning to repair his own bike instead of taking it into a shop, this vid came in handy. Thanks!
6. Good informative video. I have a slightly unrelated question for you.  What type of Chainstay Protector is that? It looks really nice.
   
   Thank you
   Mark
7. a good no nonsense vid nice one mate!
8. Nice and clear description and video thank you. So basically if either side does fit in, especially the 1mm side then you need to replace the chain and if it doesn't it's fine - is that right?
9. Replace the cassette and chainrings? What? Forgive me if I'm wrong, but that sounds like a load of crap. 
10. It would be nice to see a way to know without a tool. Unavailable for most.
11. Depends on how you ride, and how you maintain your chain. 
12. How fast does a chain normally wear out? I brought my road bike to the shop today, and they told me to replace my chain, and i did, but i only have put a little over 1,000 miles on it since i bought it a year ago. I was just wondering if that was normal. 
13. goooooood ,thank you
14. If you let the chain get bad enough, it wear the teeth down to look like shark fins. If you then put a new chain on, it will not mesh with the gears right, and it will wear the chain down faster. Best to change the chain before it gets too bad.
15. Re: worn chains: Replace the chain rings as well as the cassette? I don't think so.
16. thank you for the video.
17. Great video, but .75 is intended to mean .75% rather than .75mm. Likewise, 1 is not 1 mm. but 1%. Minor tweak. 
18. Very clear; thank you!