Is it normal for a pinpointer to not pick up gold chains?

Actually, yes... If you are talking about a small thin gold chain necklace. Even high end full size units have a hard time with small, thin gold chains. You almost need to go with a dedicated gold detector for small gold like that. Something running high a frequency (40+ Khz) This is I think 2 or 3 Khz. Go for what it's meant to do, but it's not going to pick up small gold like a prospecting machine.

Is the battery replaceable

The battery in built in unit you will have to send in to be replaced

Can I drop in down into water on a pond and use it that way? How would it alert me?

I hope I understand your question correctly. You can set the PulseDive 2-in-1 to alert you by vibration or sound and vibration or sound. There is also a light on top that blinks.

Want to take out on boat for multiple dives. Need to know charge time, approx how long is it to fully charge?

I own this metal detector and it works EXCELLENT. The manual says it takes 4 hours to fully charge but my PulseDive only takes about 2 hours to fully charge. The manual says it will hold a charge for 6 hours, but my holds a charge for (very close) to 8 hours. I have the 5.5" black coil and the 8" yellow coil and everything works GREAT! I have used it in FL, Jamaica, etc and I have found so much (good) stuff.

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Nokta PulseDive Underwater Metal Detector, Waterproof Pinpointer 2-in-1 Set for Adults with 5.5 Inch Search Coil, 3 kHz Pulse Induction Frequency, Scuba Pulsedive and Pointer

Nokta PulseDive Underwater Metal Detector, Waterproof Pinpointer 2-in-1 Set for Adults with 5.5 Inch Search Coil, 3 kHz Pulse Induction Frequency, Scuba Pulsedive and Pointer

Product ID: 125796423

Details

Brand
NOKTA
Color
Yellow
Item Weight
1 kg
Material
Plastic
Power Source
Battery

🌊Waterproof up to 60m

🎯5.5-inch precision search coil

🔋USB rechargeable battery

Description

🌟 Unlock Hidden Depths, Surface Epic Finds!

DUAL MODE VERSATILITY - Seamlessly switch between scuba detector and pinpointing modes in seconds—perfect for every adventure.
ILLUMINATE YOUR FINDS - Built-in LED flashlight brightens dark underwater spots, so no treasure stays hidden.
STAY ALERT STAY SAFE - Smart lost alarm with audible beep and flashing LED ensures you never leave your detector behind.
COMPLETE EXPLORERS KIT - Includes replaceable coils, hard-shell case, belt holster, and USB charging cable—gear up like a pro.
DIVE DEEP WITH CONFIDENCE - Fully waterproof design lets you explore underwater treasures up to 200ft deep without missing a beat.

The Nokta PulseDive is a cutting-edge 2-in-1 underwater metal detector and pinpointer, boasting a 5.5-inch search coil and 3 kHz pulse induction frequency. Waterproof up to 60 meters (200 feet) with IP68 rating, it offers quick mode switching, a built-in LED flashlight, and a smart lost alarm. Designed for serious treasure hunters and scuba enthusiasts, it comes with a full accessory kit including replaceable coils, a hard-shell carrying case, and USB rechargeable battery for extended adventures.

Specifications

ASIN	B07RL3GTVV
Best Sellers Rank	#373,067 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #451 in Metal Detectors
Brand Name	NOKTA DETECTION TECHNOLOGIES
Color	Yellow
Customer Reviews	4.3 4.3 out of 5 stars (475)
Display Type	LED
Extended Length	15.3 inches
Global Trade Identification Number	08699394001131
International Protection Rating	IP68
Item Dimensions L x W x H	15.3"L x 5.5"W x 5.5"H
Item Weight	1 kg
Manufacturer	Nokta/Makro
Manufacturer Part Number	10000113
Material Type	Plastic
Model Number	PulseDive
Number of Items	1
Number of Programs	4
Operating Frequency	3 KHz
Power Source	Battery Powered
Recommended Uses For Product	Metal Detection
search coil size	14 centimeters

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