A few weeks ago the ThinkRider PP5 became the cheapest spider power meter I’d ever tested at around $100 — and unfortunately it failed due to residual torque issues that caused inflated power readings after hard efforts. Now the spotlight shifts to the even cheaper Coospo S10 at just AU$123 (about $88 USD). On paper it’s almost identical to the PP5, claiming ±1% accuracy and the same core specs. But after giving it every opportunity to succeed across multiple tests and reference meters, the results told a familiar story – inconsistent behaviour and accuracy that simply didn’t meet its own published specifications.