smarttune sensors are designed to replace your existing turnscrews (forestay/backstay/shrouds/diagonals) and feed live load data to your phone wirelessly, or (with the addition of a Cyclops Marine Gateway) to most on-board electronics systems. smarttune is currently available in five sizes for use on boats from a wide variety of classes (sizes represent turnscrew measurements). 


Want smarttune to display on your on-board electronics?

Find out more

  • Easy install, simply swap out existing turnscrew body on your standing
  • Size based on threaded stud diameter of the wire swage.
  •  Live load wirelessly communicated to your phone.
  • Live load wirelessly communicated to your boat electronics via the Cyclops
  • Pair with smartfittings app for logging and analysis, data log also stored in Gateway. 
  • Multiple sensors can be read on one phone or gateway.
  • Loadtalk enables the load to be heard in earphones whilst sailing, ideal for
    tuning runs.
  • Precision designed for lowest weight, low windage.
  • Open body for stud to stud calibration.
  • Factory Calibrated and accurate to +/- 1% of maximum working load.
  • Durable and waterproof beyond IP67.
  • Powered by easy to source 2 x AAA batteries (approx. 6 months of battery
    life), Spare batteries supplied with order.
  • Factory set to 1Hz (fresh load reading per second)
  • For display on a smartphone, recommended range of up to 15m while sailing (connect to on-board displays via Gateway for longer range).



Thread Size


Metric Thread



165 x 61 x 26 mm

Device Weight

390 g

Breaking Load

4.75 tonnes