The 3D Touch is an affordable alternative to the original BLTouch probe. It is a high precision, touch-based bed leveling sensor intended for use with 3D Printers. 1 3DTouch V3.0 Auto Bed Leveling Sensor.
Creality Ender 3 BLTouch Installation Guide — Creality Experts
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3D Printer Parts & Accessories, BLTouch Leveling Sensor — Kingroon 3D