41 
HM42 
HM42 has a small, Ø 4 mm probe head with a length of 
235 mm. The thin structure of the probe makes it 
suitable for measurements in tight places such as joint 
spaces between tiles and beneath flooring.  
Typical applications include mapping the affected area 
in water damage restoration, measuring moisture in 
insulation materials, and measuring the equilibrium 
humidity of, for example, timber. 
 
Use a suitable tool such as a screw driver to create a space 
for the probe before inserting it. 
To avoid bending or damaging the probe, never force it 
through structures.