This is a Loos sensor, what else do you need to know. I had just moved a stay and wanted to write down all the charges. Glad I did, a couple of the lower shrouds weren't tight enough and I had the riggers adjust them. (Yes. I could have customized them, but they got it wrong!) Even if you don't plan on customizing your own rig, it costs money to keep things in check. One note: I didn't buy the 'right one', I should have bought those in the next step below as some shrouds are a bit small. However I can still use it as they are within the scale and my next boat will be larger so I think I made the right choice.
π Enhanced Precision and Functionality: Protmex Reflective Tachometer
3 Review
π Highly Efficient REED Instruments R7050 Compact Tachometer: Boost Performance with Precision Monitoring
3 Review
FITNATE Non Contact Tachometer - Enhanced Accuracy with Battery Operation
3 Review
π Neiko 20713A Contact Digital Tachometer
3 Review