The MEP professional cranks system simultaneously measures:

• Left
  (Lp),
  Right
  (Rp) and
  
  total
  (Lp+Rp)
  crank power
• Left
  (l),
  Right
  (r) crank
  offset loads
• Left / Right
  push / pull
  pedaling
  efficiency
  ratio
• Current
  GPS position
  &
  altitude
• Speed
  /
  cadence
  /
  Hart Rate
  /
  KCal

MEP mains:

• Easy
  to mount on your bike
• High
  precision
  of the measurements of left, right, total power, offset loads, and pedaling efficiency
• Sensors and electronics
  protected
  from moisture
• Fully
  configurable
  crank length
• Bluetooth
  data transmission
• Real-time
  visualization and storage
  of recorded data on PC* (
  MEPManager
  ) or on smartphone** (
  MEPPhone
  )
• Free, opensource,
  post-analisys
  tool (
  MEPAnalisys
  )