Typically, temperature inversions that cause bad air quality events occur well below 600m, if they are higher than this there is not normally a problem. However, in a valley or close to mountains, higher inversions can trap pollutants over the urban or industrial area.

MTP 5-HE is the 'extended range' version of the MTP 5-H and has similar design and features. However, it measures up to 1000m by using a more sensitive and narrower bandwidth design of microwave radiometer with the frequency slightly shifted to 'see' further into the atmosphere. A consequence of this is that the altitude resolution and the temperature accuracy are not quite as good as the MTP 5-H and there is some reduction of accuracy in heavy rain or fog.

Main features :

• Automatic temperature measurements up to 1000m
• Self-compensating for dirt
• Operates from 12 VDC