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Description
Klein Tools Inspection Camera ET21 5 Foot Borescope (5.5mm Waterproof Cable Wireless WiFi Smartphone App 480p Video Conduit Wall Void Diagnostic)Inspect Pitch Black Wall Voids and Sealed Conduit Runs via Smartphone App Video Integration The Klein Tools ET21 WiFi Borescope is a commercial grade wireless inspection camera engineered to deliver real time visual diagnostics in restricted structural spaces. This professional grade endoscope generates an independent local WiFi network to transmit 480p live video and still images directly to iOS and Android smartphones from up to 30 feet away.
Inspect Pitch-Black Wall Voids and Sealed Conduit Runs via Smartphone App Video Integration
The Klein Tools ET21 WiFi Borescope is a commercial-grade wireless inspection camera engineered to deliver real-time visual diagnostics in restricted structural spaces. This professional-grade endoscope generates an independent local WiFi network to transmit 480p live video and still images directly to iOS and Android smartphones from up to 30 feet away. Outfitted with an ultra-slim 0.22-inch diameter camera head mounted on a semi-rigid 5-foot armored cable, this rechargeable diagnostic system navigates deep internal pipeline structures and building voids safely.
Best Used For:
- Internal Wall Diagnostics: Threading through small access ports to inspect structural wall voids, hidden wiring paths, and pipe insulation without destructive cutting.
- Electrical Conduit Routing: Verifying clear paths or locating blockages inside dark commercial conduit pipes and structural junction arrays.
- Wet Pipeline Inspections: Navigating through wet plumbing assemblies, drainage lines, and HVAC evaporator coil housings using the fully submersible camera module.
Key Performance & Safety Features
- Autonomous WiFi Connectivity: Emits an independent wireless signal linking straight to smartphones up to 30 feet away without requiring external internet infrastructure.
- Ultra-Slim 5.5mm Camera: Mini 0.22-inch profile probe snout slips cleanly into constricted spaces, small bore drill holes, and complex mechanical manifolds.
- IP67 Waterproof Cable: Reinforced 5-foot camera arm resists liquid submersion, moisture ingress, and plumbing fluid corrosion.
- High-Output Adjustable LEDs: Integrated illumination array provides customizable light levels to capture bright visual frames inside unlit spaces.
- Long-Life Lithium-Ion Core: High-capacity rechargeable internal battery provides up to 8.5 hours of continuous field application run time.
What's Included
- (1) ET21 Wireless WiFi Borescope Tool Unit
- (1) Heavy-Duty USB-C Rapid Charging Cable
- (1) Utility Hook Attachment for Mechanical Retrievals
- (1) Durable Protective Carrying Case
- (1) Comprehensive Technical Instruction Manual
Technical Specifications
| Brand Manufacturer: | Klein Tools |
| Model Number (SKU): | ET21 |
| Product Type Category: | Wireless WiFi Inspection Borescope / Endoscope |
| Camera Feed Resolution: | 480p Digital Stream |
| Camera Probe Diameter: | 0.22 in (5.5mm) |
| Armored Cable Length: | 5 ft |
| Continuous Battery Life: | 8.5 Hours |
| Waterproof Rating Limit: | IP67 Compliance (Camera Tip and Snake Only) |
| Wireless Operating Range: | Up to 30 ft (WiFi Range) |
| Power Charging Interface: | USB-C Fast Port |
| Chassis Drop Protection: | 6.5 ft (2-Meter Drop Tested) |
| Digital Zoom Functionality: | Yes (Supported via ET21 Smartphone App) |
| Net System Weight: | 0.37 lbs (5.9 oz) |
PRO-TIP: When routing the 5-foot armored line into multi-angle pipe bends or deep wall voids, shape the first 6 inches of the semi-rigid tip into a modest, slight compound curve before introduction. This intentional bend permits you to scan broad internal spaces and easily rotate the entire cable housing to bypass tight corner blocks.
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.0 ★★★★★
Based on 17 reviews
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Product Reviews
★★★★★ 5
EXCELLENT PRODUCT!!!!!
If I could give it 10 stars, I would. This ball is AMAZING! Love that it's rechargeable, that it shuts off after 10 minutes of inactivity, that it changes colors. It's dark by the time I get home from work so playing ball in the dark with this ball is a game changer.
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Reviewed in the United States on December 31, 2025
★★★★★ 2
Was hopeful…
Was hoping this version would be better, but no. Welcome to the Nite Ize repair center. The pictures show the old version run by LED batteries. Although they claim the balls are waterproof, no. I’ve learned to clean out the contacts and add new batteries to reuse them, but a lot of the time the rust has already formed. The new rechargeable version is more expensive and has the same ‘waterproof’ casing. First charge was good; second charge didn’t even last for our retrieving sessions one evening. Third session on a full
Charge didn’t even last one session. Too much money for the quality. When they work - they are great. Unfortunately, still the best on the market, it it’s just like throwing away money. Innovators???
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Reviewed in the United States on October 4, 2025
★★★★★ 5
Works Great! Very bright
My dog and I really love this ball. Bought this so we can play in the field behind our house at night. Tried other balls, like the glowing ones, but they're not bright enough. Other battery powered balls don't stay on long enough and I got tired of looking for them in the dark. This one stays on, depending on the switch setting, either 5 minutes, or indefinitely until it's shut off or until the battery dies. The battery, according to the instructions, should last 10 hours before needing recharging. I've charged it once when it was received, haven't had to re-charge it yet, played with it about 7 nights now 20 min each time and it's still going.
Others have said it's not very durable, but I've found it to be durable enough to play catch with our border collie, haven't had any issues. but I don't let him chomp on it all he wants, just throw it and he brings it back. I suppose if your dog is an aggressive chewer and you let him just sit there and go to town on it, it won't last very long, just like any other ball. We use this ball only at night when needed, and use cheaper balls at other times to increase its life span.
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Reviewed in the United States on December 19, 2024
★★★★★ 5
THIS IS A MUST-BUY! If you have a dog--you NEED this ball!
Color: Orange
We have two 18-month-old chocolate Labs (brothers—basically twins with paws). The best time to walk them is early morning or just before dark… which is exactly how we managed to lose approximately 9,472 tennis balls in our cornfield. RIP, brave yellow soldiers.
So I went searching for a ball that didn’t just glow—I wanted one that full-on lights up like a tiny dog disco. Enter this LED ball. Game. Changer.
Our walks are now way more fun. The ball bounces, flashes, and changes colors like it’s auditioning for a rave. People literally slow their cars as they drive past our field just to watch the light show. I’m not saying we’re local celebrities now… but I’m not not saying that either.
And here’s the real magic: when the boys get distracted and abandon the ball (because squirrel), it stays lit so I can actually find it. We also bought a ball launcher from Walmart for about $9, and the LED ball fits perfectly—same size as a tennis ball, just 100x cooler.
This ball is waterproof and mostly floats, although I haven’t been brave enough to throw it into the pond or river because I’m positive my dogs would treat that as a full-scale navy search mission and never find it again.
It’s easy to charge, and even with 2–3 hours of walking daily, I only have to plug it in every few weeks. We’ve had it for months now and it’s still going strong—super durable. We don’t let them chew on it off-walk (because Labs), but during fetch? It’s a champ.
Also—small but hilarious detail—when they catch it, their mouths light up. I have accidentally created glow-in-the-dark dogs.
I love this ball so much I’m buying a backup because life without it is not an option. Best dog toy EVER. Whoever invented this deserves a medal, a parade, and a lifelong supply of tennis balls they’ll never lose again. 🐾💡
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Reviewed in the United States on December 1, 2025
★★★★★ 1
DISAPPOINTED
Color: Blue
only lasted 3 months after about a dozen uses. The LED core fell out and now it's totally useless. Not worth the cost at all. Disappointed because my dogs really loved them.
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Reviewed in the United States on March 26, 2026
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