Industrial Ethernet Environmental Monitoring Device (Modbus TCP/IP)

We are looking for an experienced embedded hardware developer/company to develop an OEM Environmental Monitoring Device for pharmaceutical clean rooms.
Requirements:
• Measure Temperature, Relative Humidity (RH), and Differential Pressure (DP)
• 4.3" or similar local display showing live values
• Modbus TCP/IP over Ethernet (mandatory)
• 24VDC powered
• Wall/flush mount industrial design
• Configurable alarm limits and local buzzer
• Our existing EMS software will read data via Modbus TCP (no software development required)
We plan to deploy 100–200 devices initially with potential for larger production volumes.
Preference:
• Developers who already have a similar prototype or existing industrial hardware platform that can be customized for our requirements.
• Experience with pharmaceutical, clean room, HVAC, or industrial monitoring products is highly preferred to reduce development time.
Please share:
• Similar products/projects
• Estimated development timeline
• Prototype cost
• Production cost for 100+ units
• Manufacturing capability
We are looking for a long-term OEM development and manufacturing partner.