Hygroclip 2 Water Activity Probe HC2-HP28. 10mm Stainless Steel Insertion probe for water activity (humidity), temperature and dewpoint measurements. Range 0-1 AW and -40 to +85°C. The 280mm probe is attached by 2m of TPU cable to a 7 pin UART interface. Output is 0-1V and is freely scalable, accuracy ±0.008 AW and ±0.1°C