Process Multimeters
Handheld process multimeters and loop calibrators — measure and source DC voltage, current (with 24 V loop power), frequency, thermocouple and RTD for instrumentation, HVAC and control work.
Professional OWON process multimeter category introduction
OWON HPC process multimeters combine a precise digital multimeter with an analog signal source in one rugged handheld. They measure and output DC voltage and current — with 24 V loop power for transmitter testing — plus frequency, thermocouple and RTD on the higher models, so a single tool can both read a process signal and simulate one for calibration, commissioning and troubleshooting of 4–20 mA loops and control systems.
- Loop calibration: every HPC7x+ model sources DC voltage and active/passive DC current with 24 V loop power, a dual mA/% display and manual 25%/100% stepping, auto-step and auto-ramp — ideal for 4–20 mA transmitter and valve work.
- How much you need to measure: HPC77+ (5000-count) covers DC volts, current and resistance; HPC78+ (6000-count) adds AC, frequency and wider ranges; HPC79+ adds thermocouple and RTD (Pt100) for full temperature-loop calibration.
- Field-rugged: the HPC78+ and HPC79+ are IP65 dust- and water-resistant with backlight, flashlight and auto power-off, running on 3 standard AA batteries.
Process Multimeters from OWON
Every OWON process multimeter here is a genuine unit with EU shipping and manufacturer warranty. The HPC77+, HPC78+ and HPC79+ are in stock now. Choose by the signals you need to measure and source — DC volts and mA for basic loop work, or frequency, thermocouple and RTD for full instrument calibration.
All OWON process multimeters by series
3 models across 3 series. Cards marked View & buy are in stock now on owontechnology.eu; ask us to order or quote any other model.
HPC77+ Process Multimeter
HPC77+ — 5000-count process multimeter: measure & source DC voltage and current with 24 V loop power. The entry loop calibrator.
View & buyHPC78+ Process Multimeter
HPC78+ — 6000-count: adds AC voltage/current, frequency and wider ranges (DC to 1000 V), IP65. Sources DC V/mA.
View & buyHPC79+ Process Multimeter
HPC79+ — 6000-count flagship: a full calibrator adding resistance, thermocouple and RTD (Pt100) measure & source. IP65.
View & buyYour OWON partner in Europe
Genuine OWON instruments, shipped from within the EU with full support and warranty.
EU shipping
Genuine OWON instruments shipped from within the European Union.
Warranty & support
Full manufacturer warranty and technical support from our team.
CE & RoHS compliant
Instruments that meet European safety and compliance standards.
Expert advice
Not sure which meter? Our team helps you choose the right model.
Questions about OWON process multimeters
Technical selection guidance for choosing the right process multimeter.
What is a process multimeter / loop calibrator?
A process multimeter combines a digital multimeter with a signal source. As well as measuring DC voltage and current it can output (source) precise DC voltage and 4–20 mA current with 24 V loop power, so a single handheld can both read a process signal and simulate one — used to calibrate transmitters, valves and controllers in industrial 4–20 mA loops.
What is the difference between the HPC77+, HPC78+ and HPC79+?
The HPC77+ is a 5000-count entry model for measuring and sourcing DC voltage and current with 24 V loop power. The HPC78+ steps up to 6000 counts and adds AC voltage/current, frequency and wider ranges (DC to 1000 V), and is IP65-rated. The HPC79+ adds resistance, thermocouple and RTD (Pt100) measurement and sourcing, making it a full temperature-loop calibrator.
Do the HPC process meters supply 24 V loop power?
Yes. All HPC7x+ process multimeters supply 24 V loop power while measuring loop current, so you can power and test a 4–20 mA transmitter without a separate supply. Output accuracy is up to 0.2% with a 5-digit output display; measurement basic accuracy is up to 0.1% with a 6000-count display.
Are the HPC process meters suitable for field use?
The HPC78+ and HPC79+ are IP65 dust- and water-resistant for harsh industrial environments, with a backlight, built-in flashlight and auto power-off, running on 3 standard AA batteries. The HPC77+ shares the same functions but is not IP65-rated.
Not sure which process multimeter you need?
Tell us your application and requirements and we’ll recommend the right OWON process multimeter and confirm availability.