Co-Engineered Metering Platform
Customizable, MID-Certified, Revenue-Ready. Built around your Energy Business Model.
Inside your energy
ecosystem
Our meters are embedded in complete energy solutions: from PV and storage to EV charging and HVAC. We work with OEMs to integrate metering exactly where it creates value: measurement, billing and control.
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M3PRO 80 70C: three-phase 80A energy meter rated up to 70°C. MID certified, built-in Modbus RTU. For harsh environments, outdoor cabinets and high-temperature OEM applications.
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M3PRO 80 CANbus MID: three-phase 80A energy meter with isolated CANbus 5kV, MID certified. CANopen available on request. For HVAC, machinery and OEM integration. Made in Italy.
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M3PRO 1-5 IP MID: CT-connected three-phase 1-5A meter with Modbus TCP/IP and TLS encryption. MID certified. For EVCS, storage, HVAC and ICS. Made in Italy, OEM ready.
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M3PRO 80 CANbus MID: three-phase 80A energy meter with isolated CANbus 5kV, MID certified. CANopen available on request. For HVAC, machinery and OEM integration. Made in Italy.
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M3PRO 80 IP+ MID: three-phase 80A energy meter with Modbus TCP/IP and WiFi. MID certified, 70°C range. IoT-ready for smart buildings and industrial monitoring. Made in Italy.
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LEVSEM MID: 100% tailor-made MID-certified energy meter for EV charging OEMs. Blank-sheet design, Class B accuracy, embedded integration. Accelerated time-to-market. Engineered in Italy.
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MPRO DC Modbus MID: bidirectional DC energy meter, MID certified. 4-wire connection, Modbus RTU. For solar PV, battery storage and EV DC charging. Ultra-compact. Made in Italy.
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M3PRO 80 CANbus 24V: three-phase 80A energy meter with CANbus, 24V DC auxiliary supply. For battery storage, energy storage systems and DC-powered OEM applications. Made in Italy.
Energy Meters Line-up
Our core line-up of DIN-rail energy meters covers the most common configurations and applications. Each meter is 100% designed and built in Italy, MID certified and produced under an ISO 9001:2015 quality system, and can be adapted for OEM and white-label projects.
From family company to engineering task force
Founded in 1991 and part of Hager since 2017, Herholdt Controls designs and manufactures custom and white-label metering platforms in Italy. We combine deep R&D, Italian production and a secured supply chain to deliver precise, reliable and available metering solutions for OEMs and system integrators.
About us
100% Made in Italy
Design, manufacturing and testing performed in Italy, with a tightly controlled local supplier network.
A wide range of applications
Our meters are embedded in energy solutions across multiple markets. We help OEMs choose the right platform for each application.
Advanced metering solutions for HVAC systems and heat pumps: accurate energy measurement, seamless integration with energy management platforms, and OEM-ready configurations.
Energy metering and monitoring for industrial and commercial installations: reliable data to improve efficiency, control loads, and ensure operational continuity.
Metering solutions for EV charging infrastructure: certified measurement, backend integration, and scalable solutions for OEM projects and large installations.
Thermal sub-metering for buildings and industrial sites: transparent heating and cooling energy allocation, cost distribution, and data-ready reporting for audits and optimization.
Monitoring and metering for energy storage and local generation: full visibility of energy flows, self-consumption performance, and integration with EMS and supervisory systems.
Granular energy monitoring for industrial loads, machinery, and commercial buildings: detect inefficiencies, peak demand, and anomalies to reduce downtime and energy costs.
Energy meters for AC charging stations with load management and billing support: accurate measurement, peak load control, and billing-ready data for residential, commercial, and retail environments.
Bidirectional metering for PV plants, storage systems, and hybrid installations: optimize self-consumption, grid feed-in, and advanced energy control strategies.
Energy meters for individual apartments and shared cost allocation: precise measurement, transparent cost distribution, and integration with multi-tenant management systems.
Scalable metering solutions for residential and multi-tenant buildings: sub-metering for individual units and common services, with data ready for management, allocation, and consumption optimization.
Production, calibrating and testing
From PCB assembly to final calibration, our production process is engineered for repeatability, traceability and short lead times. Italian manufacturing and a tightly controlled supplier network allow us to maintain quality while reacting quickly to market demands.
End-of-line testing procedures verify accuracy, communication interfaces and safety parameters, ensuring that every meter leaving our factory is ready for demanding field conditions.
We assemble and calibrate our meters in Italy, using automated processes and dedicated test benches. Each unit is tested against defined parameters to ensure consistent performance over its lifetime.
Our processes are certified according to ISO 9001:2015. Traceability is built into every step, from component sourcing to final inspection, enabling us to support OEM partners with documented quality and long-term product support.
Herholdt’s Lab Log
Technical notes, application insights and lab stories from our engineering team.
Read all the news
Custom metering
platform process
We design and industrialise custom and white-label metering platforms for OEMs and Hager entities, acting as an engineering task force from concept to serial production.
Developing an energy meter for an OEM means designing a platform, not just a product. Our engineering team works on custom platforms that can be adapted across multiple devices and applications: different CT types, communication options, display variants and mechanical footprints, all based on shared cores.
This modular approach helps OEMs scale faster while keeping development costs and time under control.
Accurate measurement starts with robust analogue front-end design and careful PCB layout. We engineer our meters to maintain precision across a wide operating range, with a focus on harmonic distortion, temperature drift and long-term stability.
Our team validates performance through laboratory tests and field feedback, ensuring that measured energy becomes reliable data for billing and control systems.
Behind every meter there is firmware that manages measurement algorithms, communication and diagnostics. We develop firmware in-house, supporting protocols such as Modbus, M-Bus and other industrial interfaces required by OEMs.
We collaborate closely with our partners’ engineering teams to integrate meters into their systems, from register maps and data models to firmware update strategies.
Each new platform is engineered with compliance and lifecycle in mind. We design for MID compliance and relevant standards, and we work on product variants that can be maintained over time despite component obsolescence.
Our role as an engineering task force within Hager allows us to combine simulation, lab validation and industrialisation experience, turning specifications into robust, certifiable products that can stay in the market for years.
For engineers,
by engineers.
Get in touch
Get in touch
Whether you have a technical question, need support for a specific project, or are interested in partnering with us on a tailored solution, we'd be glad to hear from you.
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