ECOTEST VIRTUOSO RKG-14 Operating Manual page 58

2.6.1.2 "Selecting height"
Select a height above a surface where the detector will be located during
testing. The higher the detector, the bigger the tested surface area is.
Select 10 cm height for local testing (surface radius up to 1-3 m), select
100 cm height for large areas (surface radius up to 20-50 m).
Important: Please read the guidelines outlined in Section 2.6.2 to make a right
choice of measurement height.
Figure 2.36 - Selecting height
56