I want to buy good EMF meter to measure electromagnetic fields (EMF). I also want to detect 5G network. What is the best meter for this kind of requirements?
I was thinking about TriField EMF Meter Model TF2.
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The purpose of meters such as the TriField model you mentioned is to measure close field strength. However, it will not discriminate between radio signals used by an analog radio, a digital radio, 2G, 3G, 4G, or 5G cellular transmissions, so a meter like that won't tell you if the RF you measure is from 5G, 2G, broadcast, or a spark gap transmitter.
5G frequencies start (in the US) around 600 MHz (T-Mobile) and goes up to 72 GHz; whereas the aforementioned device is limited to a range of 20 MHz – 6,000 MHz (6 GHz). Therefore, that device could only receive some cellular transmissions.
Frequencies used for cellular and other uses differ depending on which country you're in or near (the Northern tier of the US has restrictions to prevent conflicts with different uses of frequencies in Canada, for example).
To discriminate between a non-cellular radio signal, and digital cellular radio signals, the most practical device is a 5G-capable cellphone with apps from the Google Play store or Apple App Store equivalent. For greater capabilities, you're talking about equipment from Ericsson, Huawei, and Nokia costing tens of thousands of dollars.