Review on 🚲 Bikehand Bicycle Bike Chain Wear Indicator Tool Chain Checker – Compatible with Shimano Sram KMC and All 7-12 Speed Chains: A Must-Have for Bike Maintenance by Garrett Craven

Chain wear is 0.75% and 1.0% on the pass/non-run side. While it's better than nothing in a holdall, you really should have a model that has a 0.50% wear rate. This is the best time to replace the chain without changing gears. Such chain wear patterns exist. Even better, since chains are relatively cheap, just replace them at the time you would normally do "chain maintenance", which is self-deception at best, unless you're using ultrasonic cleaning tanks and whatnot.