I myself have the expertise for radiation protection, if I do not use professionally. The device is suitable in order to make a statement to whether an increased radiation is present or not. For the uninitiated, the bit reads in the matter perfectly adequate. The above conversions are sufficiently accurate for the stated purpose. Four instead of five stars only because I find that something more fundamental physics in the description should be. The unit itself is a "people's Geiger counter" fully sufficient.