EMFields Measuring Equipment - Instrument Comparison Page
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» Measuring Equipment » [Overview] [Acoustimeter] [Pro] [ELF 3030B] [HFE35C]
It is currently not possible to order from overseas via the site. If you are based overseas (or simply wish to order by phone), please contact the sale office on +44 (0)1353 778814 to place your order. Alternatively, for overseas customers, you can email us on info@emfields.org with your order, and we will raise a PayPal invoice for you. This can help if the time difference makes it difficult to phone within our working hours. We aim to dispatch most products within 2 days of receiving your paid order.
It's not always easy to work out which of our instruments you need. As our instrument range expands, we thought it would be good to have a checklist so you can easily compare what each instrument does.
| Radiofrequency (microwave) | Powerfrequency | |||
| Acoustimeter |
HFE35C | PRO | ELF3030B | |
| Digital Display |  |
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| Lights (LEDs) | |
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| Sound | |
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| Shows average & peak | |
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| Detects TV & radio mast signals | |
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| Detects microwave fields (radiofrequency) | |
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| Detects electric & magnetic fields (powerfrequency) | |
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| Directional | |
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| Technical knowledge NOT required | |
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| Available to hire (when in stock) | |
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| Available to buy (when in stock) | |
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| Measurement range | 200-8000 MHz |
27-3300 MHz |
7-2000 Hz |
16-2000 Hz |
| Sensitivity | 0.02 V/m 1 µW/m² |
0.1 µW/m² | 0.01 µT 1 V/m |
0.001 µT 1 V/m |
| Max sensitivity | 6 V/m 100,000 µW/m² |
1999 µW/m² | 19.99 µT 1999 V/m |
1.99 µT 1999 V/m |
Differences between the ELF3030B and the EMFields PRO meter
The EMFields PRO and the Gigahertz 3030B can give different electric field readings, with the 3030B often presenting a figure around twice that of the EMFields PRO. This is not a calibration error or inaccuracy, but is instead due to a different method of assessing the electric field.
The 3030B is designed and calibrated to measure the electric field at the end of the instrument in direct relation to ground. This is why they recommend using the earthing lead they provide with the instrument, and using this lead is required for your measurement of the electric field relative to ground to be accurate with respect to the ground. This will always give a considerably higher measurement reading, unless you are standing with bare feet on an earthed conductive surface.
The EMFields PRO is designed to measure the electric field level which your body is experiencing, so it is relative to your body, instead of to ground. This was intentional as we believe that it is the actual fields that your body is experiencing that matters most.
An example of the difference is that birds can perch on very high-voltage powerlines without being injured. This is because they only have a low number of volts actually across their body. However, they are technically sitting at hundreds of thousands of volts relative to the Earth. In this situation, the 3030B would read hundreds of thousands of volts (way over scale and it would be permanently damaged), but the PRO would read only a few hundred or less.
The 3030B can be used like the PRO (without the earthing lead), but if used this way it still gives higher readings. If held in the same manner as the PRO (at the bottom, around the battery compartment) then it reads roughly twice as high as the EMFields PRO.