ial feature, or a confusing one – depending on your needs.
This one also does not give actual readings, but just has different colored lights: green-safe, yellow-caution, and red-unsafe. Also like the one above, this one is only a single-axis meter. This means it can only read the radiation coming from the direction you are pointing it. So if you want to measure the radiation in any given spot, you need to rotate and point the meter at 8 different points/directions around in a complete circle – pausing at each new point to let it pick up the new reading.
The better feature of this meter (over the Simple Radiation Meter above) is that covers 30 Hz – 5.5 GHz, so a much wider range of devices – but it still won’t catch the new 5.8 GHz cordless phones, baby monitors, etc.
It is also really small (keychain sized) only 1″x3″ – which again, may be a positive or a negative, depending on what you want it for. More details here… (scroll down the page)
3. Basic RF Meter ($89.95) – This is another simple RF Meter and this one ONLY measures radio frequency microwave radiation (not electrical, nor magnetic fields), so less room for confusion. This one only measures up to 58 microwatts/cm2, so same problem using in North America where our upper “safety” limit is 1000 microwatts/cm2 – you’ll know it’s unsafe, but you won’t know how bad it is.
Also like the meter above, this one is only single-axis. So you’ll have the same tedium of having to measure at 8 different points/directions around in a complete circle – pausing at each new point to let it pick up the new reading – to get an idea of what radiation exists in any one spot. The good part about this meter is that it will give you the actual meter reading (e.g. 18 mW/m2) PLUS give you the color-coded ranges of safe/green-caution/yellow-unsafe/red.
This meter covers 100 Hz – 3 GHz – so it will give you readings for most cell phones, wireless computers and cell towers. However, the newer generation of cordless phones and other technology on the 5.8 GHz frequency will not be picked up by this meter. More details here… (scroll down the page)
4. 3-Axis RF Meter ($199.95) – As you move up the price scale, you’ll notice you get more features and more accuracy. So this meter is a 3-axis meter, rather than a single-axis, like the two meters above. This means that you don’t need to rotate around, but can simply stand in one spot and the meter will scan 360 degrees around you to give you the complete/total radiation level for that particular spot. This meter will also give you the actual radiation level, but again, it only measures up to 30 microwatts/cm2. So if you just want to know whether a spot or room is “safe” this meter is fine, but if you want to know how much radiation above 30 microwatts/cm2 is present, then you’re out of luck (remember, US and Canada upper allowable limit is 1000 microwatts/cm2).
This meter covers 50 Hz – 3.5 GHz – so it will give you readings for most cell phones, wireless computers and cell towers. However, the newer generation of cordless phones and other technology on the 5.8 GHz frequency will not be picked up by this meter. More details here…
5. 6 GHZ RF Meter (Uni-directional $119 + free shipping) – this meter is very reasonably priced and will measure 100 HHz – 6 GHz. It also measures electrical fields (power lines etc.) The only downside is that it is uni-directional only (not a tri-field meter). This means that you will have to rotate slowly in a circle, stopping and pausing at each point to get a measure of total radiation for any one spot. On the other hand, it makes it easy to pinpoint which direction the radiation is coming from! More details here…
6. 8 GHZ RF Meter (Uni-directional $179.90 + free shipping) – This meter is much cheaper than the the Tri-Field below because it only measures radiation coming from one direction, whereas the Tri-Field meter below measures radiation coming from all sides. This meter measures electrical, RF, and magnetic fields as well. So if price is key, then this is a very good choice, since it measures all RF devices (cell 