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RMP400 high-accuracy machine probe

For workpiece inspection and job set-up on small to medium sized multi-tasking machines and 5-axis machining centres.

Unrivalled 3D accuracy and repeatability.

Superior communication capability.

Outstanding performance for less scrap and higher profits.

Part of the QE series, the RMP400 is an ultra-compact, high-accuracy touch probe with radio signal transmission which offers all the benefits of automated job set-up as well as the ability to measure complex 3D part geometries on CNC machining centres, including multi-tasking machines.

Successfully combining patented strain gauge technology with reliable frequency hopping radio transmission, the RMP400 provides superior performance found in all Renishaw high-accuracy probes.

The RENGAGE technology family

Reduce scrap, enhance productivity and increase profits – Renishaw machine tool probes can keep your machining process under control.

RMP400 probing bore

Superior 3D accuracy

Delivers unrivalled submicron performance when measuring complex 3D shapes and contours.

Ultra-low trigger force

Unmatched low trigger force for delicate work helps eliminate surface and form damage.

Robustly engineered

Robust, even in the harshest environments, providing reliable measurement and long service life.

Inspect difficult parts

Improved accuracy when using long and custom styli means difficult parts can be measured with ease.

RMP400 deep bore

0.25 µm 2σ

Unidirectional repeatability

±1.00 µm

3D lobing in X, Y and Z

0.09 N

Ultra-low stylus trigger force in XY

Extremely reliable radio transmission

Renishaw radio probes use radio transmission with frequency hopping spread spectrum technology (FHSS).

FHSS technology enables devices to avoid interference and transmission dead spots, ensuring impressive reliability even in high-density radio frequency environments.

Renishaw probes use the globally recognised 2.4 GHz waveband and are compliant with radio regulations all over the world.

3D measurement with RENGAGE™ technology

MP250 strain gauge mechanism

RENGAGE™ technology, combines proven silicon strain gauge technology with ultra-compact electronics – allowing on-machine probing systems to achieve outstanding 3D measurement capability and submicron repeatability.

As the strain gauges are independent from the kinematic mechanism, probes with RENGAGE technology have an ultra-low trigger force – providing exceptional measurement accuracy as well eliminating the possibility of surface and form damage.

GoProbe app

System components

RMP400 components

Radio interface

The radio interface uses FHSS technology to convey and process signals between the inspection probe and the CNC machine controller. Both the RMI-Q and RMI-QE can be used with Renishaw radio inspection probes.

RMP400 inspection probe

A 40 mm diameter touch-trigger inspection probe, equipped with RENGAGE™ technology for high-accuracy measurement and FHSS technology for reliable transmission.


A range of solid high modulus carbon fibre styli has been developed for use specifically with strain gauge probes. These styli are designed to minimise pre-travel variation and improve the accuracy of the probe.

Next steps

Contact your local sales representative if you think the RMP400 is right for you.

Find out more

For installation manuals, user guides and compliance information, visit our technical support library.

The Renishaw advantage

At Renishaw, we enjoy an excellent reputation for offering strong support to our customers through a network of over 70 service and support offices worldwide.

Get technical support, training and advice or purchase spares and accessories from our well-stocked Online store.