If the lure swims left and right, it will not be able to fully utilize its performance, so an eye tuner is essential.
Eye tuning has become commonplace due to the boom in floating minnows, but it can be a hassle when the size you want is not available when you want to use it. However, this TIMON eye tuner matches the eye line diameters used in area trout fishing, 0.6mm, 0.7mm, 0.8mm, and 1.0mm, and the corresponding line diameters are displayed on the top of the slit, so you can see at a glance which line diameter you want to use.

The handle has a scale for measuring the size of the lure, so you can instantly check whether the lure you want to use complies with the regulations of the fishing spot. It also comes with a ring so it won't get in the way even when hanging.