--- 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: "€ 106.61" currency: EUR in_stock: true reviews_count: 8 category: "Rattmmotor" url: https://www.desertcart.pt/products/255990065-rattmmotor-normally-open-mach3-cnc-automatic-tool-sensor-gauge-changer store_origin: PT region: Portugal --- # 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:** € 106.61 **Availability:** ✅ In Stock ## Summary > ⚙️ Elevate your CNC game with precision that never quits! ## 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?** € 106.61 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.pt](https://www.desertcart.pt/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 - • **Magnetic Mounting:** Strong bottom magnet ensures stable, easy installation directly on your CNC machine body. - • **Robust Durability:** Engineered with dustproof, waterproof housing and super hard alloy contacts to withstand harsh CNC environments. - • **Pinpoint Precision:** Achieve micron-level accuracy with 0.001mm positioning for flawless tool calibration. - • **Smart Safety Alerts:** Built-in over-travel alarm protects your machine from costly errors and downtime. - • **Seamless Integration:** 4-wire design outputs direct signals to your CNC system—no amplifier needed, reducing setup complexity. ## Overview The RATTMMOTOR Mach3 CNC Tool Sensor is a high-precision, 4-wire Z-axis probe designed for CNC routers and engravers. It offers 0.001mm positioning accuracy, durable dustproof and waterproof construction, and a magnetic mount for easy installation. Compatible with Mach3 and UCCNC, it streamlines tool length setting, wear detection, and breakage alerts without requiring additional amplifiers, making it an essential upgrade for professional-grade CNC workflow efficiency. ## 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: False advertising - This is not a Normally Open tool sensor. It is NC. I've ascertained that the only way it could be a normally open sensor is to have a built-in FET circuit. Aka would need to be a six-wire unit requiring voltage to invert the state. 6-wire versions provide both NC and NO states. 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. ## 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 Name | RATTMMOTOR | | Current Rating | 20 Milliamps | | Customer Reviews | 3.1 3.1 out of 5 stars (34) | | Global Trade Identification Number | 00713721466467 | | Item Dimensions | 5.91 x 2.76 x 4.33 inches | | Item Weight | 0.45 Kilograms | | Manufacturer | RTM | | Material Type | Aluminum | | Maximum Supply Voltage | 24 Volts (DC) | | Measurement Accuracy | 0.0001% | | Model | H:65 | | Mounting Type | Surface Mount | | Output Type | Push-Pull | | Sensing Distance | 5 Millimeters | | Style Name | Modern | | UPC | 713721466467 619191755172 769135849716 | | Unit Count | 1.0 Count | ## 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 ### ⭐ False advertising *by K***N on March 7, 2026* This is not a Normally Open tool sensor. It is NC. I've ascertained that the only way it could be a normally open sensor is to have a built-in FET circuit. Aka would need to be a six-wire unit requiring voltage to invert the state. 6-wire versions provide both NC and NO states. ### ⭐⭐⭐⭐⭐ 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. ## Frequently Bought Together - 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 - PGFUN DIY CNC Touch Probe XYZ Axis 3D Digitizing Edge Finder 3-Coordinate Measuring Sensor Kit with 6 mm Shank & 2.0 mm Tungsten Steel Ball Tip --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.pt/products/255990065-rattmmotor-normally-open-mach3-cnc-automatic-tool-sensor-gauge-changer](https://www.desertcart.pt/products/255990065-rattmmotor-normally-open-mach3-cnc-automatic-tool-sensor-gauge-changer) --- *Product available on Desertcart Portugal* *Store origin: PT* *Last updated: 2026-05-15*