Concerning Kagura and accurate power reading using power meters:

Minoura tests the Kagura SMART trainer exclusively on the Power Tap G3 and Shimano Power Crank and is calibrated to work most accurately with these meters. We understand that there are many other power meters on the market and we’re trying hard to add more testing units to our lab. Because each power meter has a slightly different set of programmed instructions on how power is read, along with varying readings from different programs on the market to use on SMART trainers, you will see a difference in readings that range from 0% using he Power Tap G3, to +/- 5% using non-tested power meters.

Please also note that it isn’t uncommon for reading to spike in one direction or the other when using programs made for Smart Trainers like Zwift, Kinomap, TrainerRoad, The Sufferfest, and others. This is normal and will be averaged out at the end of the ride through algorithms in both the programs software and the firmware found inside the Kagura unit. Your readings should be accurate to within the stated percentages upon completion of your ride.