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. Designed to be used for long spells in extreme conditions, they charge wirelessly for an astonishing 2,000 hours of continuous battery life. Available in 7 sizes, for a wide range of classes (sizes represent turnscrew measurements). 


Want smarttune to display on your on-board electronics?

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    • Factory calibrated and accurate to +/- 1% of maximum working load. 
    • Pair with smartfittings app for logging and analysis.
    • Wireless Charging.
    • 2,000 Hours Battery Life (10 x previous model)
    • Fully Charged in 1 Hour / Charged for a Full Day’s Use in 1 Minute
    • Live load wirelessly communicated to your phone – approx 60% longer Bluetooth range than previous model.
    • Direct connection with SAILMON MAX display (No Gateway Device Required).
    • Live load wirelessly communicated to other boat electronics via the Cyclops gateway.
    • Enhanced Background Logging on Mobile and Gateway Device.
    • Multiple sensors can be read on one phone or gateway.
    • Precision designed for lowest weight, low windage.
    • Even more Robust & Waterproof.
Thread Size


Metric Thread



165 x 61 x 26 mm

Device Weight

390 g

Breaking Load

4.75 tonnes