The measurements are in milliwatts (mw) per square meter but most standards use microwatts (μw) which are 1000 times smaller.
The TriFIELD meter uses milliwatts so 15mw/m² = 15000 μw/m²
Click on pictures to enlarge.
The Building Biology Evaluation Guidelines recommend a peak power density of less than 0.1 μw/m² for safe HF signals. [link]
All readings on this page are far in excess of this.
See also: Safety Levels
Oxstall campus
Power density: 19000 μw/m²
Stroud Road
Power density: 14000 μw/m²
Park and ride off Naas Lane/Waterwells
Power density: 17700 μw/m²
Opposite cemetery, off Findlay Rd roundabout
Power density: 2000 μw/m²
Near B&M, Kingsway
Power density: 9000 μw/m²
Stop Cheltenham 5G 