About Us



Delta OHM is an Italian company that designs, manufactures and calibrates portable and bench-top instruments, process and industrial meters, current loop or voltage transmitters, data loggers and sensors since 1978 establishing an excellent international reputation.

The range includes measurement of the following physical parameters: Temperature, Air speed, Relative Humidity, Dew point, Pressure, Radiometry/Photometry (including UVA, UVB, UVC, PAR, PHOT, BLUE, V-Eff, Lux, W/m²).

Instruments for Safety and Industrial Hygiene monitoring as Noise Level meters (I and II class), Building Acoustic Sound Sources, Vibration meters, Microclimate WBGT, Non coherent Optical Radiation monitor, Acoustic and Accelerometer calibrator.

Water analysis instruments: pH, ORP, Conductivity, TDS, Dissolved Oxygen, Turbidity.

Devices for Building Management (BMS), HVAC and Lighting as Temperature and Humidity Sensor, Light Level Sensor, CO and CO2 controller, Heat Stress Meter, Anemometer, Wireless Dataloggers, Spectroradiometer.

Equipment for Renewable Energy such as Portable Solar Radiation meter, Pyranometer (any class), Solar panel temperature sensors, Pyrheliometer, Sunshine Duration, Wind Speed.

Delta OHM also produce devices for Weather Station, Hydrology and Agriculture such as: Albedometer (Secondary Standard, I and II class), Aspirated air temperature, Barometric Pressure, Rain Detector, Bucket Rain Gauge (200cm² and 400cm²), 16 channel Data Logger, Global irradiance in the UVA and in the UVB, Leaf Wetness, Net-radiometer, Photometric probes LUX, Pyranometer (Secondary Standard, I and II class, Silicon), Pyrgeometer, Pyrheliometer, Quantum (PAR), Rain Detector, Soil Moisture, Soil Temperature, Thermo-hygrometer, Ultrasonic Anemometer (2 & 3 axis), Sunshine Duration, UV Index.

Delta OHM's Calibration Center, based on six modern laboratories equipped with a state of the art equipment, is ISO 17025 accredited and part of the international circuit ilac-MRA (ilac-MRA ACCREDIA LAT n°124). Our laboratories are accredited for the following physical quantities: Temperature, Humidity, Pressure, Air Speed, Acoustic and Photo radiometry.

Since 2015 we are part of GHM GROUP, a company born from the fusion of the Greisinger, Honsberg, Martens, Imtron and Delta OHM companies but that still considers itself a tradition oriented company. The central focus is the bundling of technological expertise for development of customer-oriented solutions that are appropriate for the market and tailored to the high demands of industry and producing industry. In addition to long-term expertise and state-of-the-art production methods, the GHM GROUP offers competent application consultation and comprehensive customer service, high flexibility even for small part quantities, quick device adaptations and short delivery times. This is all offered at an outstanding price-performance ratio.

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