Bike seat center adjuster with calibration indicator1. Precision Alignment: Effortlessly mount the bicycle handlebar saddle positioner at the center of the handlebars; when the light aligns with the tire's center, you've achieved the perfect adjustment.<br> 2. Versatile Use: Designed for multi-purpose adjustments, this bicycle calibrator is your go-to for aligning handlebars, saddles, and more, ensuring your bike is set up for optimal performance.<br> 3. Construction: Built to last, this bicycle handlebar saddle calibration device withstands the rigors of regular use, providing a reliable solution for maintaining your bike's alignment over time.<br> 4. Effortless Setup: Say goodbye to the guesswork and strain of aligning saddles and handlebars by eye; this handlebar saddle positioner simplifies the process, ensuring a straight and comfortable ride every time.<br> Colour:Black<br> Material:Plastic<br> note:3 x button batteries not included<br> Package Contents:<br> 1 * Bike Handlebar Calibrator<br> Only the above package content, other products are not included.<br> Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.