This is intended as a workplace monitor it might also be useful as a survey meter in a nuclear event. It has a rechargeable battery so you wouldn't be hunting for some odd battery type or size.
I'm spending too much time on Rx painkillers to be functional enough to do a good review on a device like this so I won't be getting one in the immediate future.
You can download the manual from that page so you can read the specs without the hype ;-) The device reads in milli-Sieverts and micro-Sieverts and can be set for audio and/or visual alerts when you've received a specific dosage of radiation. No click-click-click that gets faster as the radiation gets higher but an audio alert that's triggered below the threshold of injury would tell you to leave the area.
Prelude to the Apocalypse: Dark Days in Alabama | The Shadetree Mechanic The Waif: Treasure Hunt (Lisa Bonner) | The Waif: Growing the Tribe An Accidental Family | Just Another Voicemail: Things Fall Apart The Coming Storms | Care & Feeding of a PAW Fiction Writer's Muse In the Dark | The Recycled Homestead: prelude to the apocalypse? Jack's War Book 1 | Jack's War Book 2 | Jack's War on Winter All books: www.amazon.com/stores/author/B01LVX00LP/allbooks