Field measurement often means switching between contact temperature, differential temperature and ambient parameters without losing time on setup. PRO 921/925 supports this work with two compensated Type K thermocouple inputs and one M12 input for DX digital probes, making it well suited for HVAC, building and energy measurement tasks.
The instrument helps teams work confidently on site and at the bench. It measures Type K temperature from -220.0…+1372.0 °C, automatically calculates differential temperature when two thermocouples are connected, and displays values, statistics or live charts on a multilingual backlit dot matrix LCD. Interchangeable DX probes extend the same handheld platform to temperature, humidity, pressure, IAQ and photo-radiometric quantities.
Designed for practical field use, the housing offers ingress protection (IP) 67 except TC inputs, side rubber protection, a foldable stand and a magnet. PRO 925 adds file-based logging up to 1 million data sets, with CSV readout via USB C.
The meter provides two compensated Type K thermocouple inputs for surface, immersion or differential temperature measurements. When two probes are connected, the temperature difference between the channels is calculated automatically.
The M12 input connects DX series digital probes. Supported probe types include temperature, humidity, pressure, indoor air quality, photo-radiometric quantities and soil moisture, depending on the probe connected.
The multilingual dot matrix LCD offers several measurement screens, including large single values, multi-row display, Min/Avg/Max statistical information and graphical chart view for selected parameters.
PRO 925 includes automatic and single-shot logging. Logged files contain date and time stamps with measurements of all channels and can be viewed or downloaded through USB C mass storage mode.
Configurable alarm thresholds can be assigned to selected measurements. Alarm signaling can use the buzzer, flashing backlight and red flashing status LED.
The instrument operates with 4 AA alkaline batteries or external 5 Vdc via USB C. Auto-off and configurable backlight settings support energy-saving operation.
The menu allows selection and sorting of displayed quantities, unit configuration, favorite menu shortcuts, protected mode with PIN code and measurement correction settings.
