Right, so I'm basically skint but I wanted to start doing some actual investigation work rather than just reading about it online. Bought a SQ Labs EMF detector from Amazon for £34.99 and I've had it about two weeks. Quick thoughts:
What is it: Handheld EMF meter. Battery operated (takes 2 AAA), roughly the size of a thick mobile phone, has a digital display and a sensitivity dial. Detects electromagnetic fields in the range of roughly 50-2000 milligauss. Pretty basic specs.
The Good: It works. I tested it near various electronics and it responds appropriately - picks up fields from my WiFi router, my laptop, my microwave, etc. Response is fairly immediate. The sensitivity dial lets you adjust the detection range. It's portable and battery-efficient. Price is genuinely unbeatable.
The Bad: Not waterproof. No data logging function - you have to manually write down readings. Display is a bit small. No audio alarm, just visual, which is annoying if you're trying to move around while monitoring. The instructions are rubbish. Build quality feels cheap - I wouldn't want to drop this.
For paranormal investigation: Honestly? It's fine as a starter tool. Will it detect genuine paranormal activity? Who knows - depends if paranormal activity actually generates EMF signatures, which is debated. But it's good for establishing baseline readings in a location and spotting anomalies. At this price point, even if it's completely useless for ghosties, it's not a massive loss.
If you've got more budget, get something better. But if you're starting out and want to do actual fieldwork without spending hundreds, this does the job.