https://www.thegrommet.com/tauten
Never tie a fishing knot again.
In 30 seconds this fishing line welder does it for you, creating a virtually indestructible bond where your knot would be.
After you’ve run your line through the hook, loop and load your lines into the welder and press “GO.” That’s it. In less than a minute it welds a smooth polymer sleeve over both.
Tauten’s surgical precision isn’t just a coincidence. One of the company’s founders had experience manufacturing welding devices for medical procedures. That got him thinking about other knot-tying activities. Fishing immediately came to mind.
Whether you’re a pro or just easing your way into a new hobby, you’ll spend less time calculating what knot to tie and more time fishing.
Price:
SAMSFX Fishing Quick Knot Tying Tool 4 in 1 Fly Line Clippers with Zinger Retractor Combo (Silver)
(145) 
Price: $6.99
XJunion Fishing Quick Knot Tying Tool Multi-Function 4 in 1 Fly Line Clippers with Zinger Retractor Combo
Tips:Come with paper instructions in the packProduct descriptionSpecification:●Name: 4-in-1 Quick Ligation Tool.●Color: black，Silver.●Material: 420 stainless steel.●Applicable: Easy to use nail knot tools come with a zinger retractor, ... (as of June 13, 2019 - More infoProduct prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on [relevant Amazon Site(s), as applicable] at the time of purchase will apply to the purchase of this product.)
Price: $15.99
SAMSFX Fishing Pliers and Quick Nail Knot Tool Combo (Green Camouflage)
SAMSFX FISHING MAKING YOUR FISHING SIMPLE & EFFICIENTPay Attention: Please allow 0.4-0.8 " (1-2 cm) differences due to manual measurement Due to the difference between different monitors, the picture may ot reflect the actual color of the... (as of June 13, 2019 - More infoProduct prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on [relevant Amazon Site(s), as applicable] at the time of purchase will apply to the purchase of this product.)
Price: $8.45
Discountflies Stainless Steel Line Nipper, Nail Knot Tool, Hook Eye Cleaner & Hook Sharpener (Satin)
(10) 
No thanks.
Can’t you just melt the line to itself and do the same thing?
Ummmm go to CVS and buy a one dollar lighter.
Doesn’t take me 30 secs to tie any knot no thanks
it’s too big knot, sorry
Great product? As a former guide and an avid fisherman who is going to pay $200.00 for a gizmo that “locks” a lure on to your line? Any quality, experienced fisherman knows that conditions change rapidly requiring one to change lures and strategy often, even when undertaking an activity such as ice fishing. In addition what it the cost per use? One has to buy “kits” to keep this product functional so that would be valid information in attempting to market such a device. Maybe this is something that would be an asset for bait fishermen, but even that is questionable. All things considered, I don’t know any pro or novice that would really see any value in such a device.