Micro Probe V2 Biqu

Perfect for the MP3DP V5, and this fan mount, https://www.printables.com/model/800811-fan-adxl345-biqu-micro-probe-v2-mount-for-the-h2-v

This thing is tiny, Pictures with the BL Touch to show size comparison (BL Touch not included).

More info, https://github.com/bigtreetech/MicroProbe

【High Precision】BIQU MicroProbe V2.0 auto bed leveling sensor adopts electromagnetic components+photoelectric sensors chip, accuracy is 0.001mm Standard Deviation @24°C,0.003mm Standard Deviation @60°C,compared to other auto bed leveling sensors, the accuracy is improved by 10 times.
【Super Lightweight and Small】BIGTREETECH MicroProbe V2.0 is 25.3mm Length,6g in weight,it is 37% shorter,40% Light,more than BL touch/CR Touch auto bed leveling sensors. it adds almost no weight to the extruder and upgrade high-precision leveling capability.
【Durable and Long Lifespan】MicroProbe V2.0 uses metal probe, makes itself wear-resistant and durable, Removable and replaceable probing pin with a long service life of up to 10,000,000+ Probing Tests, will be a perfect upgrade for your printer.