How much variation is there across the surface of the probe?

The metal part is fine with no significant variation (although it is grooved so I guess a very sharp v bit might have tiny variation) its the plastic holder that needed work on mine. I ended up taking the metal out and tapping a small screw on the side.

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⚡ Elevate your CNC game—precision tool setting made effortless!

SEAMLESS COMPATIBILITY - Works flawlessly with Mach3 and GRBL (Candle) controllers for smooth integration.
AUTO RETURN POSITIONING - Automatically returns to a predefined position, streamlining your workflow and saving time.
COMPACT LIGHTWEIGHT DESIGN - Small 3x3x1.4 cm footprint and just 30g—fits perfectly without adding bulk.
DURABLE ABS ALUMINUM BUILD - Engineered for longevity with premium materials that withstand daily CNC rigors.
EFFORTLESS TOOL HEIGHT CALIBRATION - Set your CNC tool height with a single click—no more guesswork or paper tricks.

The SainSmart CNC Router Z-Axis Tool Setting Touch Probe is a compact, corded electric device designed for precise and automatic tool height calibration. Compatible with popular CNC controllers Mach3 and GRBL, it features an auto-return function to predefined positions, streamlining tool changes and setup. Built with durable ABS and aluminum, it offers a lightweight yet robust solution for professional-grade CNC machining.

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Manufacturer	SainSmart
Part Number	101-60-386
Product Dimensions	3 x 3 x 1.4 cm; 30 g
Item model number	0816550022757
Style	For 3018-PRO, 3018-PROVer, 3018-PROVer Mach3
Material	Aluminium Acrylonitrile Butadiene Styrene (ABS)
Pattern	for 3018-PROVer/PROVer Mach3/ 3018-MX3
Power Source	Corded Electric
Voltage	2.3E+2 Volts (AC)
Item Package Quantity	1
Batteries included?	No
Batteries Required?	No
Battery description	Corded electric
Item Weight	30 g

SainSmart CNC Router Z-Axis Tool Setting Touch Probe, Compatible with Grbl/Mach 3

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