I am a physical therapist and have used this to calculate my patients total distance. He always stood on firm and level ground. It lasted for a while. But after a few weeks I had to glue it to the full telescope length because the clips that allow you to shorten it broke off. I ended up using it for another 4 months but eventually it became too loose and wobbly. I bought another measuring wheel for about $10 more and it lasted over a year and I still have it. This product was ok for the price but it wasn't worth it for how quickly it broke for me :/
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