Safe and Sound Pro II Meter · to buy

What it is: Your own Safe and Sound Pro II radio frequency EMF meter, to keep.

What it measures: Wi-Fi, phones, smart meters, phone towers and other wireless devices. It shows peak, max and average readings in microwatts per square metre (µW/m²). It's third-party certified from 400 MHz to 7.2 GHz and picks up signals from 200 MHz to 8 GHz, with sound to help you track down the source.

In the box: The meter, a zippered case and user's guide. Rechargeable via USB-C, with 12 to 15 hours per charge. 2-year manufacturer's warranty.

Who it's for: Anyone who wants to keep checking at home, at work or when travelling. Hired one and want to keep it? Your hire fee comes off the price if you buy within 14 days.

Delivery: Please allow 1 to 2 weeks.