Why does it say "Accuracy of 5% at 50-60 Hz"... only 5% accuracy??

Looks like it measures a very specific range of frequencies (Extremely Low to Very Low), and 50Hz is the lower end of it's range. So it might pick something up down there but is made for higher signals; probably pretty accurate at say, 5kHz.

Aside from "ghost hunting", does an emf meter have any usefulness?

Actually, this little meter has been around for a long time; only recently coming into fashion for "ghost hunting" expeditions. It can be used by electricians, plumbers heating and air people, burglar alarm companies, etc. in the fields of home building, protecting or repair. Look it up online with the query - "official uses for K-II EMF meter" and this should better answer your question.

Does this meter auto shut off if left on for extended amount of time?

No you need to manually shut it off

Does this item have sound?

Sorry, no they do not, but I bought a cheap simple piezo buzzer from radio shack & a chrome switch & soldered it onto the board for sound, not the greatest buzzer but it works, I recently re-sold 2 of these on ebay because we prefer the Mel Meter with shadow detector built in & the cheaper Ghost Meter, they work much better after we've used all 3 for years, that's why we sold the k-2 it just got famous because they use it on Tv, but the Ghost meter has nice sound & looks good, not the Pro version of Ghost Meter, they kinda ruined it with that version, but just the plain old Ghost Meter, if you have the money spend a $100 on the mel meter if you have more get it with the shadow detector built in, it's works great,

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K-II EMF Meter for Ghost Hunting

Product ID: 5008006

Details

Brand
K-II
Special Feature
Authentic K2 -
Color
Gray
Age Range (Description)
Adult
Included Components
Battery 9V
Outer Material
Plastic

⚡0.5s instant EMF response

📊Multi-segment LED display for clear readings

🔋9V battery powered for portability

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26.96 OMR

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Description

👻 Detect the unseen. Own the moment.

PRECISION ACCURACY - Reliable readings with ±5% accuracy at 50-60 Hz, trusted by pros and paranormal enthusiasts alike.
AUTHENTIC PORTABLE - Made in the USA, lightweight 4.6 oz design powered by a single 9V battery—take it anywhere your curiosity leads.
WIDE FREQUENCY RANGE - Detects both ELF (50-1,000 Hz) and VLF (1,000-20,000 Hz) bands for comprehensive EMF monitoring.
INSTANT EMF DETECTION - Catch every electromagnetic spike in real-time with lightning-fast 0.5 second response.
USER FRIENDLY OPERATION - Effortless push-on/push-off design means no complicated setup—just measure and go.

The K-II EMF Meter is a professional-grade, portable device designed to instantly detect electromagnetic field fluctuations across ELF and VLF ranges with ±5% accuracy. Featuring a clear multi-segment LED display and simple push-button operation, it’s powered by a single 9V battery and crafted in the USA for reliability. Ideal for ghost hunters and EMF-conscious professionals seeking precise, real-time readings in a compact form.

Specifications

Brand	K-II Enterprises
Special Feature	Authentic K2 Meter - Made in USA
Color	Gray
Age Range (Description)	Adult
Included Components	Battery 9V installed
Outer Material	Plastic
Display Type	LED
Product Care Instructions	Wipe Clean
Unit Count	1.0 Count
Power Source	Battery Powered
Model Name	K-II-DELUX
Number of Batteries	1 9V batteries required.
Response Time	0.5 seconds
Reusability	Reusable
Style	Specialized
Indoor/Outdoor Usage	Indoor
UPC	749447008742 888917005628 798256213571 185842000095
Global Trade Identification Number	00185842000095
Manufacturer	K-II Enterprises
Part Number	K-II-DELUX
Item Weight	4.6 ounces
Product Dimensions	5.51 x 1.97 x 0.98 inches
Item model number	K-II-DELUX
Batteries	1 9V batteries required.
Is Discontinued By Manufacturer	No
Material	Plastic
Voltage	9 Volts
Item Package Quantity	1
Special Features	Authentic K2 Meter - Made in USA
Batteries Included?	No
Batteries Required?	Yes

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