Micro Traxion or Spoc: Don't Choose Wrong
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The Petzl Micro Traxion and the Edelrid Spoc are comparable progress capture devices with integrated pulleys and cams with teeth that clamp down on the rope. Here's a quick compare and contrast for those trying to decide between the two devices.
You can buy the Petzl Micro Taxion, here; and you can buy the Edelrid Spoc, here.