---
product_id: 255990065
title: "RATTMMOTOR Normally Open Mach3 CNC Automatic Tool Sensor Gauge Changer CNC Z Axis Probe Tool Touch Sensor Setter Setting 4 Wires for CNC Router Engraver Machine"
brand: "rattmmotor"
price: "C$7924"
currency: NIO
in_stock: true
reviews_count: 8
category: "Rattmmotor"
url: https://www.desertcart.ni/products/255990065-rattmmotor-normally-open-mach3-cnc-automatic-tool-sensor-gauge-changer
store_origin: NI
region: Nicaragua
---

# 0.001mm ultra-precise positioning DC24V 20mA low power rating Dustproof & waterproof durability RATTMMOTOR Normally Open Mach3 CNC Automatic Tool Sensor Gauge Changer CNC Z Axis Probe Tool Touch Sensor Setter Setting 4 Wires for CNC Router Engraver Machine

**Brand:** rattmmotor
**Price:** C$7924
**Availability:** ✅ In Stock

## Summary

> ⚙️ Elevate your CNC game with precision that professionals trust!

## Quick Answers

- **What is this?** RATTMMOTOR Normally Open Mach3 CNC Automatic Tool Sensor Gauge Changer CNC Z Axis Probe Tool Touch Sensor Setter Setting 4 Wires for CNC Router Engraver Machine by rattmmotor
- **How much does it cost?** C$7924 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.ni](https://www.desertcart.ni/products/255990065-rattmmotor-normally-open-mach3-cnc-automatic-tool-sensor-gauge-changer)

## Best For

- rattmmotor enthusiasts

## Why This Product

- Trusted rattmmotor brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Built to Endure:** Dustproof and waterproof design ensures flawless performance even amidst coolant and metal shavings.
- • **Magnetic Mounting:** Strong bottom magnet for effortless, secure attachment—install and go in seconds.
- • **Pinpoint Precision:** Achieve micron-level accuracy with 0.001mm positioning—never compromise on your tool measurements.
- • **Smart Safety Alerts:** Over-travel alarm protects your machine from costly errors and downtime.
- • **Seamless Integration:** 4-wire normally open sensor outputs direct signals to your CNC system—no amplifier needed, no signal drift.

## Overview

The RATTMMOTOR Mach3 CNC Automatic Tool Sensor is a high-precision, 4-wire normally open Z-axis probe designed for CNC routers and engravers. Featuring 0.001mm positioning accuracy, a durable dustproof and waterproof housing, and a strong magnetic base, it delivers reliable tool length setting, wear detection, and breakage alerts without requiring an amplifier. Compatible with Mach3 and UCCNC, it streamlines tool changes and enhances machining accuracy for professional-grade results.

## Description

RATTMMOTOR Normally Open Mach3 CNC Automatic Tool Sensor Gauge Changer CNC Z Axis Probe Tool Touch Sensor Setter Setting 4 Wires for CNC Router Engraver Machine: desertcart.com: Industrial & Scientific

Review: Working well and seriously streamlines my workflow. - My initial order had some confusion with the item I received but the seller to care of the issue right away. I am very happy with the overall service. The Z-Axis gauge works well and the tests I have done so far show it has solid repeatability. I don't have an automatic tool changer. This allowed me to seriously streamline my tool changing process and got rid of a huge source of errors as I switched out tools. Overall it is well worth it. Note - I initially bought this for use on a 4x4 CNC Router running on Mach3. I have since shifted over to UCCNC and am very happy with the change. This Z-Axis probe worked fine on both. Actually even better on UCCNC since I have more probe inputs.
Review: Surprisingly repeatable. Some weirdness in the description and was I received - What was shown seems to be the product I was shipped but the dimensions are way off. The two hold down screws are M4, not M5 (advertised as 5.3 mm when in fact what I was shipped is 4.05 mm). Not a good start to a precision instrument. I will update this as I get it installed. UPDATE: I am happy with the repeatability. The unit is worth the money. It looks crooked when sitting on a flat surface and it is. But it's been adjust to actually be flat for both top and bottom but the body and slide switch are slightly off center. I wouldn't be shocked to learn they are discarded from a manufacturer because they have visual defects but are still usable. Maybe when I have more money I will get a nicer unit but right now it's returning good consistent numbers. NOTE: the mounting screw holes are M4. The compressed air system is a M5 metric pneumatic connector. You can get them that will allow a 6mm the OD (4mm ID) tube and get a 1/8 NPT to 6mm OD fitting for your solenoid if you have a standard USA system like I do.

## Features

- 【Description】The tool setting instrument is a special tool setting instrument for the engraving machine machining center machine. The output signal of the tool setting instrument is received by the numerical control system and then the tool length setting, tool wear detection and tool breakage are detected by the program control. In the case of no vibration and malfunction, the thermal deformation of the machine can be corrected according to the rated voltage and current and the specified speed.
- 【Parameter】This is a normally open 4-wire high-precision tool setting instrument with a stroke of 5mm. The positioning accuracy is 0.001mm, the contact life is up to 3 million times, the contact force is 1.5N, and the contact rating: DC24V 20mA.
- 【Material】The housing material of this tool setter is made of 4S grinding grade material. The bottom magnet design can be directly connected to the machine and firmly adsorbed to the body. The contact material is made of super hard alloy, the design is exquisite and the installation is simple.
- 【Feature-1】This tool setting instrument is designed with dustproof and waterproof structure, which can still have strong durability under the condition of coolant and iron filings. It does not need a built-in amplifier and will not be caused deviations by the location temperature and power supply voltage fluctuations of the tool setting instrument, which can be directly input to the NC program.
- 【Feature-2】The tool setter will send out an alarm signal in time when it is over-travel to avoid other troubles caused by equipment operation. Moreover, the tool setter has strong anti-interference. The protruding sharp corner of the tool directly touches the tool tip related to the machining size, detects its value and size, and outputs the signal. It has higher accuracy than the average value obtained by converting the amount of light and electricity.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B08LK93NTC |
| Brand | RATTMMOTOR |
| Current Rating | 20 Milliamps |
| Date First Available | March 12, 2019 |
| Global Trade Identification Number | 00713721466467 |
| Is Discontinued By Manufacturer | No |
| Item Weight | 15.8 ounces |
| Item dimensions L x W x H | 5.91 x 2.76 x 4.33 inches |
| Item model number | H:65 |
| Manufacturer | RTM |
| Material | Aluminum |
| Maximum Supply Voltage | 24 Volts (DC) |
| Measurement Accuracy | 0.0001% |
| Mounting Type | Surface Mount |
| Output Type | Push-Pull |
| Product Dimensions | 5.91 x 2.76 x 4.33 inches |
| Sensing Distance | 5 Millimeters |
| Style | Modern |
| UPC | 713721466467 619191755172 769135849716 |

## Product Details

- **Brand:** RATTMMOTOR
- **Item Weight:** 0.45 Kilograms
- **Item dimensions L x W x H:** 5.91 x 2.76 x 4.33 inches
- **Material:** Aluminum
- **Style:** Modern

## Images

![RATTMMOTOR Normally Open Mach3 CNC Automatic Tool Sensor Gauge Changer CNC Z Axis Probe Tool Touch Sensor Setter Setting 4 Wires for CNC Router Engraver Machine - Image 1](https://m.media-amazon.com/images/I/71bLea7Wj9L.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Working well and seriously streamlines my workflow.
*by D***N on July 17, 2019*

My initial order had some confusion with the item I received but the seller to care of the issue right away. I am very happy with the overall service. The Z-Axis gauge works well and the tests I have done so far show it has solid repeatability. I don't have an automatic tool changer. This allowed me to seriously streamline my tool changing process and got rid of a huge source of errors as I switched out tools. Overall it is well worth it. Note - I initially bought this for use on a 4x4 CNC Router running on Mach3. I have since shifted over to UCCNC and am very happy with the change. This Z-Axis probe worked fine on both. Actually even better on UCCNC since I have more probe inputs.

### ⭐⭐⭐⭐ Surprisingly repeatable. Some weirdness in the description and was I received
*by J***B on June 21, 2022*

What was shown seems to be the product I was shipped but the dimensions are way off. The two hold down screws are M4, not M5 (advertised as 5.3 mm when in fact what I was shipped is 4.05 mm). Not a good start to a precision instrument. I will update this as I get it installed. UPDATE: I am happy with the repeatability. The unit is worth the money. It looks crooked when sitting on a flat surface and it is. But it's been adjust to actually be flat for both top and bottom but the body and slide switch are slightly off center. I wouldn't be shocked to learn they are discarded from a manufacturer because they have visual defects but are still usable. Maybe when I have more money I will get a nicer unit but right now it's returning good consistent numbers. NOTE: the mounting screw holes are M4. The compressed air system is a M5 metric pneumatic connector. You can get them that will allow a 6mm the OD (4mm ID) tube and get a 1/8 NPT to 6mm OD fitting for your solenoid if you have a standard USA system like I do.

### ⭐ False Advertising
*by I***O on December 10, 2025*

This is not a Normally Open tool height sensor like the title said. I have tested it and both the main and the overtravel contacts are Normally Closed. I have paid premium price thinking that I am getting the correct sensor. Now my machine build is delayed! .... False advertising. Buyers beware!

## Frequently Bought Together

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*Product available on Desertcart Nicaragua*
*Store origin: NI*
*Last updated: 2026-02-20*