ROTRONIC provides a high-end laboratory device – the HygroLab C1 – for water activity measurements with up to four probes. Connect station probes and insertion probes for measuring water activity in cheese, meat, tobacco, building materials, animal feed, pharmaceuticals products and much more.

Validated software
Easy-to-use and intuitive, the laboratory grade indicator can be used by anyone. HW4 running on a PC provides remote monitoring with charting and data recording functions.

• 4 input channels for HC2 station probes or HC2 insertion probes can be connected for measurement of water activity, relative humidity and temperature 
• Aw Quick function for fast measurement results (typically 4-5 minutes) 
• Audible alarm to indicate completed measurement 
• Saves up to 2,000 data records with %RH, °C/°F, date and time




225 x 170 x 70 mm


1100 g

Range of application

-10…60 °C (14…140 °F) / 0…1 Aw / 0…100 %RH

Power supply / Power consumption

8…16 VDC (+ AC adapter)

Current consumption

Max. 120 mA (12 VDC, backlight ON, 4 probes connected, Ethernet)


All psychrometric calculations available or user defined calculations

Probe connections

4 x HC2 station probe or HC2 insertion probe

Start-up time

3 s

Measurement interval

1 s

Parameters shown

Aw, % RH, °C, °F


3-line alphanumeric with trend indicators


Real time clock provides a time stamp for every measurement

Memory size

4 x 500 Aw values (2,000 Aw values)

HW4 compatible

V3.1 and higher

Probe adjustment

Single or multiple point for relative humidity & temperature. 
One or two point temperature

Aw Quick function

Integrated and via HW4 software HW4-P-QUICK-Vx (in shipment included)

Communication interfaces

Ethernet / USB


Aluminum, ABS-757

IP protection rating



FDA 21 CFR part 11 / GAMP5

CE / EMC conform

EMC 2008/108/EG