Strenx by Gymwatch
Tech specs 
TypeGymWatch measures strength and motion across fitness exercises, including machines, free weights and bodyweight.
ChargingMicro USB
Battery lifeBetween 10-30 days (depending on the frequency of training).
Weight
Water resistanceSplash-proof
SensorThe sensor contains a combination of inertial Sensors, which record the course of your limb movements in all axes.
DisplayLED light
Metrics 
TracksThe sensor records the full range of motion of an exercise, determines every strength component, all repetitions and detects incorrect exercise execution to help ensure exercises are performed properly.
Other
Links 
Affiliate link*Amazon
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