The HygroPalm HP23-AW-A offers the perfect solution for on-site water activity measurements to confirm product stability and indicate shelf life. The HP23-AW-A is suitable as a mobile laboratory unit. Equal to the HygroLab C1 the HP23-AW-A is perfect as a portable analyzer with two probe inputs for any suitable HC2 probe. The HP23-AW-A can also be used in conjunction with HW4-P-QUICK-Vx.

Portable and convenient
Handheld instrument specially configured to suit the water activity user. It includes many of the advanced features of the HygroLab C1, but in a convenient portable configuration.medicines, horticulture, agriculture, etc.

• 2 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 10'000 data records with %rh, °C, date and time
• Battery charging function



188 x 72 x 30mm



Range of application

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

Power supply

9 V battery or USB/ mains adapter via mini USB

Current consumption

Max. 20 mA (backlight ON)


All psychrometric calculations available

Number of probe inputs


Probe connections

2 HygroClip2 or analog input 0…3.2 VDC (power supply for analog probe: 5 VDC)

Start-up time

3 s

Measurement interval

1 s, 10 s, 1 min, 10 min

Parameters shown

Aw, % RH, °C, °F


3-line alphanumeric with trend indicators

Acoustical alarm (Beeper)


Battery indicator



Real time clock provides a time stamp for every measurement

Memory size

Capture mode: 8 x 250 values / Logging mode: 10,000 values

HW4 compatible

Yes, for all HW4 versions

Probe adjustment

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

Aw-quick mode


Aw Quick function

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

Firmware update

With internet and HW4 software

Communication interfaces

Mini USB

Service Interface

Mini USB

Enclosure material


IP protection rating