Mayatech MT5 5KG Motor Thrust Tester Propeller Tension Power Measurement For RC Model Racing Drone
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The cheapest of them all at this time. Trendy looks and nice colour. Handy size and can fit almost anywhere. Poor instructions but no rocket science. Fiddly to fit the screws in the back of the motor. Bit fragile so you need to be gentle with it, and 5kg rating is overrated in the long run. Could do with a bigger screen, or at least as an option, or may be a screen that tilts, so you don't have to put your head above it to see the reading. Overall verdict, good value for money and I'm happy with it.
Works very well, I added a label over the Chinese markings: "on/off" "gm/ oz" and "Reset". I added an adapter using pillars as in this appears to be more designed for in-runner motors, see pictures.