Stages Dura Ace R9200 Dual

Stages Power meter is built on Shimano Dura-Ace R9200. The Stages Power meter is placed on both sides of the crank in order to independently measure a rider's left and right legs.
 
Size: 175mm - 52/36
Accuracy: ± 1.5%
Power meter housing: low profile design, with robust door interface
Weight: Only adds 15g to base crank arm
Battery Life: 175+ hours (coin cell: CR2032) 
Power range (Watts): 0 to 2500
Cadence range (rpm): 10-220
Water resistance rating: IPX7
 
"In summary this is the best Shimano based dual sided power meter crankset that I have tested either indoors or out." - Shane Miller, GPLama 
 
The Dura-Ace 9200 crankset is compatible with all 12-speed Shimano Hollowtech II road bottom brackets.