The WatrLevel has channels on both sides, what are they for?
The right side has a fractional scale and the left side a Metric scale. Both sides use 5/16″ outer diameter (OD) tubing that can be purchased from any hardware store. We designed the WatrLevel with these channels so the tubing could be easily replaced ( the tubing will deteriorate eventually). If you need to replace the tubing just use a little soapy water or Windex and it will slide right in.
