When you have found the depth for your float, mark it on your rod using tippex. Then, if you change hooks or shallow up, you can always return to the original depth later.
Steve Randles
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BZS H Block Marker Float - High Visibility and Accurate Depth Marking
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Sealey Centre Punch Automatic Heavy-Duty Punching Marking Depth Adjustment
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PCL Tyre Tread Check Depth Gauge 1-26mm With 1.6mm Mark VOSA Approved TDG16C01
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Portable Car Tyre Depth Gauge Meter with 25MM Tread Mark Measuring Tool