Tool Setter vs Edge Finder: Which One Should You Buy?
A head-to-head between tool setters and edge finders, using the Edge Technology 04-000, the NYMOLABS wireless probe, the Mitutoyo 050103 and the Starrett 827A.
On this page
Top picks at a glance
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- 1
04-000 Pro Touch Off Gage9.5/10View on Amazon - 2
Starrett Edge Finder9.4/10View on Amazon - 3
Mitutoyo 0501039.4/10View on Amazon - 4
Mitutoyo 050102View on Amazon - 5
Brown & Sharpe Standard Edge FinderView on Amazon - 6
Brown & Sharpe Audible Edge Finder 3/8" Shank DiameterView on Amazon - 7
Starrett Edge FinderView on Amazon - 8
Mitutoyo 050109 1/2" X .500" Edge Finder 0.500" tip diameterView on Amazon - 9
CNCTOPBAOS 3D Electronic Trigger Edge Finder CNC Touch ProbeView on Amazon
A CNC setup starts before any cutting, and it starts with measurement: how long is the tool, and where does the part sit. Tool setters handle tool length; edge finders handle part location. The tool setter vs edge finder question is really about which setup job slows you down, and this comparison works through it side by side, with the Edge Technology 04-000 and the NYMOLABS wireless Z probe as the setters, against the Mitutoyo 050103 and the Starrett 827A as the finders.
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Verdict: pick a tool setter if you zero Z by touching off tools: the Edge Technology 04-000 is a mechanical setter with a stated 0.0002 in repeatability, and the NYMOLABS wireless probe adds cable-free probing with stated GRBL and Mach3 compatibility. Pick an edge finder if you dial in part edges, hole centers and scribed lines: the Starrett 827A and the Mitutoyo 050103 are hardened, USA-made mechanical finders. Match the tool to the setup job you repeat.
Machines on the list
04-000 Pro Touch Off Gage
A mechanical Z-axis tool setter with a 4 in offset, a hardened stainless contact face and stated 0.0002 in repeatability.
Pros
- Stated 0.0002 in repeatability for tool length offsets
- Hardened stainless steel contact face, 1 in across, so all endmill flutes make contact
- Rectangular base with recessed indicator face fits between vise jaws on parallel bars
- Lightly spring-loaded face protects against overrun; padded case included
Cons
- The spec table states Item Weight as 0.27 g, an implausible figure that reads like a unit error
- No warranty term is stated
- Controller compatibility is not stated
- Designed around a 4 in offset, so it assumes a mill-sized setup
CNC Router Wireless Z-Axis Probe Tool Setter 3-Pin
A wireless Z-axis tool setter for CNC routers with up to 0.02mm stated accuracy and GRBL and Mach3 compatibility.
Pros
- Wireless operation with transmitter and receiver modules, no cable clutter
- Stated accuracy up to 0.02mm on the SUS304 stainless steel plate
- 3-pin 5-24V input, Normally Open, compatible with GRBL and Mach3 systems
- Up to 3,000 tool setting operations from one CR2032 coin cell
Cons
- Battery powered, so the CR2032 cell needs replacing
- No warranty term is stated
- Compatibility beyond GRBL and Mach3 controllers is not stated
- Package dimensions are stated but the probe footprint is not separated out
Starrett Edge Finder, .200" Contact Diameter
A USA-made mechanical edge finder with a .200 in contact diameter and hardened, lapped tool steel construction.
Pros
- Stated .200 in contact diameter and .375 in body diameter
- Tool steel body and contacts, hardened, ground and lapped to close tolerances
- Locates flats, shoulders, grooves, round work and centers of circles, and scribes lines
- Protective case included; made in the USA
Cons
- No accuracy or repeatability figure is stated
- No warranty term is stated
- Mechanical only: no electronic signal or wireless option
- Single purpose: it locates edges and centers, not tool length
Mitutoyo 050103, Edge/Center Finder
A USA-made edge and center finder with a 3/8 in shank and a 0.200 in tip.
Pros
- 3/8 in diameter shank with a 0.200 in diameter tip
- Center-finder end for hole centers, punch marks and scribed lines
- All working surfaces hardened and ground
- Made in the USA
Cons
- No accuracy or repeatability figure is stated
- No warranty term is stated
- The spec table gives the model as 50103 while the title says 050103, so the exact model code is unclear
- Mechanical only: no electronic signal or wireless option
Other machines to compare
Mitutoyo 050102Check price on Amazon
Brown & Sharpe Standard Edge FinderCheck price on Amazon
Brown & Sharpe Audible Edge Finder 3/8" Shank DiameterCheck price on Amazon
Starrett Edge FinderCheck price on Amazon
Mitutoyo 050109 1/2" X .500" Edge Finder 0.500" tip diameterCheck price on Amazon
CNCTOPBAOS 3D Electronic Trigger Edge Finder CNC Touch ProbeCheck price on Amazon
Side by side
| Spec | Edge Technology 04-000 | NYMOLABS Wireless Probe | Starrett 827A | Mitutoyo 050103 |
|---|---|---|---|---|
| HQ Score | 63 | 57 | 56 | 54 |
| Side | Tool setter (mechanical) | Tool setter (wireless) | Edge finder (mechanical) | Edge finder (mechanical) |
| Stated accuracy | 0.0002 in repeatability | Up to 0.02mm | Not stated | Not stated |
| Contact | 1 in hardened stainless face | SUS304 stainless steel plate | .200 in contact diameter | 0.200 in diameter tip |
| Offset / shank | 4.000 in (101.6mm) offset height | Not stated | Not stated | 3/8 in shank |
| Compatibility | Not stated | GRBL, Mach3, 3-pin 5-24V NO | Not stated | Not stated |
| Power | Not stated | CR2032, up to 3,000 operations | Not stated | Not stated |
| Case | Padded case included | Not stated | Protective case included | Not stated |
| Origin | Not stated | Not stated | Made in the USA | Made in the USA |
Specifications are manufacturer rated, as published on each listing and collected 22 October 2026.
Tool Setter vs Edge Finder: How They Differ
Tool setters sit under the spindle and establish tool length offsets, which is how the control learns where each tool tip is in Z. The Edge Technology 04-000 does this mechanically, with a stated 4 in offset height, a hardened stainless contact face 1 in across, and a lightly spring-loaded face that protects against overrun. The NYMOLABS probe does the same job wirelessly, with a transmitter and a receiver, an SUS304 stainless steel plate, and stated accuracy up to 0.02mm.
Edge finders go in the spindle and locate the workpiece: edges, hole centers, punch marks and scribed lines. The Mitutoyo 050103 combines an edge end with a center-finder end on a 3/8 in shank, and the Starrett 827A locates flats, shoulders, grooves and round work with a stated .200 in contact diameter. Neither job replaces the other; a shop that swaps tools and dials in parts may honestly need both sides.
Accuracy and Contact
The setter side states its numbers. The Edge Technology listing gives high-accuracy 0.0002 in repeatability, and the NYMOLABS listing states accuracy up to 0.02mm on its machined SUS304 plate. The 04-000’s 1 in contact face is sized so all endmill flutes touch at once, avoiding issues from small variations in flute length, per the listing.
The finder side states dimensions but no accuracy figures: the Mitutoyo 050103 lists a 0.200 in tip on a 3/8 in shank, and the Starrett 827A lists a .200 in contact diameter on a .375 in body. With no stated accuracy, their repeatability stays unclear; that is a gap in the listings, not a verdict on the tools.
Power and Compatibility
Only the NYMOLABS probe needs power: a single CR2032 coin cell, included, rated for up to 3,000 tool setting operations. Its 3-wire, 3-pin design takes DC 5-24V input, is Normally Open (NO), and is stated compatible with desktop CNC routers and most CNC machines running GRBL and Mach3 controllers. The box also includes a cable, double-sided tape, the receiver module, the transmitter module and a user manual.
The remaining listings are mechanical and state no power source. The 04-000 works off its 4.000 in (101.6mm) offset height with a large 2.2 in dial, and the finders simply spin in the spindle.
Build and Origin
Materials are stated plainly. The 04-000’s contact face is hardened stainless steel; the NYMOLABS plate is SUS304 stainless steel. The Starrett body and contacts are tool steel, hardened, ground and lapped to close tolerances for diameter and concentricity. The Mitutoyo’s working surfaces are hardened and ground.
On origin, both finders state made in the USA; the setter listings state no origin. The 04-000 ships in a padded case and the 827A in a protective case; the other listings state no case.
Choose a tool setter if
- You touch off tool length often and want a mechanical gauge: the 04-000 states 0.0002 in repeatability with no battery to replace.
- You run a GRBL or Mach3 router and want cable-free probing: the NYMOLABS probe states compatibility and up to 3,000 operations per cell.
- You like a wide contact face for multi-flute endmills: the 04-000’s 1 in face covers all flutes at once.
Choose an edge finder if
- You dial in edges, shoulders and grooves: the 827A is built for exactly that, in hardened lapped tool steel.
- You also find hole centers and punch marks: the 050103 adds a center-finder end.
- You want USA-made mechanical tools: both finders state it, and the 827A adds a protective case.
Accurate zeroing pairs well with a clean shop: for dust and fume protection while cutting, see the best respirator for CNC router picks.
Project Match
Pair the project with the pick, using only what the listings state.
| Project | Pick | Why it fits |
|---|---|---|
| Setting tool length on a mill | Edge Technology 04-000 | Stated 0.0002 in repeatability; 4 in offset; padded case |
| Wireless Z probing on a router | NYMOLABS wireless probe | Stated GRBL and Mach3 compatibility; up to 3,000 operations per cell |
| Locating edges and scribing lines | Starrett 827A | .200 in contact diameter; hardened, lapped tool steel |
| Finding hole centers and punch marks | Mitutoyo 050103 | Center-finder end; hardened and ground surfaces |
FAQ: lasers and CNC
What is the difference between a tool setter and an edge finder?
A tool setter measures tool length so the control can set Z offsets; the Edge Technology 04-000 and the NYMOLABS wireless probe both do that job, one mechanically and one wirelessly. An edge finder spins in the spindle and locates workpiece edges, hole centers and scribed lines; that is the Mitutoyo 050103 and the Starrett 827A. They solve different halves of setup.
Can one tool do both jobs?
No. None of the 4 listings claims both functions. The 04-000 states tool length offsets and the NYMOLABS states Z-axis tool setting, while the 050103 and the 827A state edge, center and line location.
What accuracy figures do the listings state?
The 04-000 states 0.0002 in repeatability and the NYMOLABS probe states accuracy up to 0.02mm. The Mitutoyo and Starrett listings state no accuracy figure, which leaves their repeatability unclear.
Do any of these need power?
The NYMOLABS probe runs on a CR2032 coin cell rated for up to 3,000 operations. The remaining listings state no power source; they are mechanical.
Is a warranty stated?
No warranty term is stated in any of the 4 listings, so buy on the stated specs and the fit for your machine.
Related: best respirator for CNC router and best water based cutting fluid.
