Disclosure
This website is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
Ever tried to figure out what’s clogging a drain or see inside a wall without tearing it open? I’ve been there, and that’s exactly why I tested the Klein Tools ET21 WiFi Borescope. This little inspection camera connects wirelessly to my phone and has a 5-foot, waterproof snake to get into tight spots.
This tool is perfect for homeowners, DIYers, or mechanics who need a visual aid for basic inspections. It stands out with its simple phone app and adjustable LED lights, but the 480p video resolution is its main trade-off for the convenience. Here’s what I found after using it on a few real jobs around my house.
- WIFI CONNECTIVITY: Wireless borescope transmits video and images directly...
- COMPACT 5.5MM CAMERA: High-quality inspection camera provides clear visual...
- 5-FOOT WATERPROOF CAMERA: Durable IP67-rated camera with high-flex snake...
What Stands Out — Key Features
- Wireless WiFi Connection: I loved not being tethered by a cable. It transmits video to my smartphone from up to 30 feet away, which gives me plenty of room to move.
- Compact 5.5mm Camera: The small camera head really does get into tight spaces. It provided a clear view for my visual inspections in confined areas.
- 5-Foot Waterproof Snake: The IP67-rated camera is fully waterproof. The high-flex snake maneuvered around obstacles in a drain pipe while still holding its shape when I needed it to.
- Adjustable LED Lighting: The built-in LEDs are a must. I could adjust them to get a clear picture in dark environments like inside a wall cavity.
- iOS and Android App: The free Klein Tools ET21 app was simple. I could instantly connect, view the feed, and save or share images and videos right from my phone.
- Durable Build: Weighing only 0.74 pounds, it feels solid and well-made, which I expect from the Klein Tools brand.
- Simple Media Handling: It saves files in common JPEG and MP4 formats, so sharing what I found was easy with anyone.
Full Specifications
Pros & Cons — The Honest Take
✅ What I Like
- The wireless WiFi connection is super convenient, letting me move up to 30 feet away from my phone.
- The 5.5mm camera is tiny and the 5-foot high-flex snake is perfect for navigating pipes and walls.
- IP67 waterproof rating means I didn’t hesitate to use it in wet environments like drains.
- The adjustable LED lighting was crucial for getting a clear picture in dark, cramped spaces.
- The free app for iOS and Android is straightforward for viewing, saving, and sharing images instantly.
❌ What Could Be Better
- The 480p video resolution is functional but noticeably lower quality than modern smartphone cameras.
- The fixed focus and lack of autofocus means you can’t adjust for super close-up details.
For most DIY jobs, the pros of wireless freedom and a durable, waterproof design far outweigh the cons. You just have to be okay with standard-definition video instead of HD.
⚖️ How Does It Compare?
When looking at the Klein Tools ET21, I think it’s helpful to see it against two common alternatives. I picked these because one is a wired version from the same brand, and the other is a typical generic WiFi model you’ll see everywhere.
- HIGH RESOLUTION IMAGING: The Utility Borescope features high-resolution...
- FLEXIBLE AND DURABLE DESIGN: Equipped with a flexible and durable 9.8-Foot...
- CLEAR VIEWING: Experience exceptional image quality on 4.3-Inch LCD color...
🔵 Alternative 1: Klein Tools ET17
Best for: Users who want a direct, reliable USB connection and don’t mind being tethered to their device.
Key specs: USB connection, 5.5mm camera, check listing for length, likely similar waterproof rating.
Where it beats the main product: It often comes at a lower price point since it doesn’t have WiFi hardware.
Where it falls short: You lose the 30-foot wireless freedom, which is the ET21’s biggest selling point.
- 1920P HD Resolution: Sewer camera with 7.9mm probe can inspect...
- Easy Connection: This borescope inspection camera can easily and quickly...
- Semi-Rigid Cable & Waterproof Probe: Snake Camera can bend freely and...
⚪ Alternative 2: Kinpthy Endoscope Camera
Best for: Budget-focused buyers who prioritize higher video resolution over brand reputation.
Key specs: WiFi connection, often 1080p resolution, various lengths available, semi-rigid cable.
Where it beats the main product: It typically offers 1080p video, which is a big step up from the ET21’s 480p.
Where it falls short: Build quality and durability, especially the IP67 waterproofing, are often not as trustworthy as the Klein Tools brand.
I’d recommend the wired ET17 if your budget is tight and your inspection spot is right next to your laptop. Choose a generic brand like Kinpthy if 1080p video is your absolute top priority. But for a balanced mix of wireless convenience, trusted durability, and a simple app, the ET21 is my pick.
How It Actually Performs
Wireless Connectivity & Range
The claim of a 30-foot wireless range is pretty accurate in an open space. I could walk around my garage while watching the feed on my phone without any lag or dropouts. The connection process through the app was straightforward. However, the signal did get a bit spotty when I tried to go through multiple walls, which is expected but worth noting for larger jobs.
Image Quality & Lighting
The 480p video resolution is the tool’s main limitation. It’s perfectly fine for identifying a pipe blockage or a lost screw in a wall, but don’t expect crisp, detailed imagery. The adjustable LED lighting, however, is excellent. In a dark drain pipe, I could brighten the LEDs enough to see clearly, and the fixed focus kept everything in a usable view.
Durability & Waterproofing
The IP67 rating gave me confidence. I used the camera in a wet sink drain and had no issues. The 5-foot high-flex snake feels durable and it held its shape when I needed to push it forward, but it also bent easily around corners. The orange color and solid 0.74-pound build make it feel like a real tool, not a cheap gadget.
App Functionality & Ease of Use
The free Klein Tools ET21 app is simple and gets the job done. Connecting was a one-tap process after the initial setup. I liked that I could instantly save photos as JPEGs or videos as MP4 files to my phone’s gallery for easy sharing. The interface is basic, offering manual or automatic shooting modes, which is all I really needed for a quick inspection.
Who Should Buy This Generator?
Not every inspection camera is right for every person. Based on my testing, here’s who will get the most out of the Klein Tools ET21 and who should probably keep looking.
✅ This Is a Great Fit If You…
- Are a homeowner or DIYer who needs to peek inside walls, pipes, or ducts without making a huge mess.
- Want the freedom of a wireless connection so you’re not tied down by a USB cable during your inspection.
- Need a durable, IP67 waterproof tool you can trust in damp environments like under sinks or in drain lines.
- Prioritize a simple, reliable tool from a known brand over having the absolute highest video resolution.
❌ You Might Want to Look Elsewhere If…
- You require high-definition 1080p or 4K video for detailed professional inspections or documentation.
- Your projects regularly need more than the 5-foot cable length to reach deep into long pipes or cavities.
- You need advanced camera features like autofocus or optical zoom to examine fine details up close.
My top recommendation is for the casual user who values wireless convenience and trusted build quality for occasional jobs. If your main goal is identifying problems, not filming them, this is a solid pick.
- WIFI CONNECTIVITY: Wireless borescope transmits video and images directly...
- COMPACT 5.5MM CAMERA: High-quality inspection camera provides clear visual...
- 5-FOOT WATERPROOF CAMERA: Durable IP67-rated camera with high-flex snake...
Common Issues & Fixes
I ran into a few small hiccups while using this borescope. Here are the problems I found and how I solved them.
WiFi Connection Drops
The problem: The camera’s WiFi signal sometimes disconnects or gets choppy, especially at longer ranges.
My fix: First, make sure your phone is within the advertised 30-foot range with minimal obstructions. If it’s still unstable, try forgetting the camera’s network in your phone’s WiFi settings and reconnecting through the app.
Blurry or Dark Image
The problem: The picture looks fuzzy or too dark to see anything useful.
My fix: Remember, this has a fixed focus, so you can’t adjust it. Clean the camera lens with a soft cloth. Then, use the app to crank up the adjustable LED lights—this makes a huge difference in dark spaces.
App Won’t Connect or Freezes
The problem: The Klein Tools ET21 app fails to connect to the camera or freezes during use.
My fix: Close the app completely and restart it. As a last resort, I had to uninstall and reinstall the app once, which cleared up a persistent connection glitch.
Snake Cable Won’t Stay Rigid
The problem: The high-flex snake is too floppy to push forward into a horizontal pipe or cavity.
My fix: This cable is designed to flex around bends, not stay perfectly stiff. For straight runs, I gently twisted it as I pushed to help it maintain a bit more forward momentum.
Warranty & Support
The manufacturer’s warranty details need to be requested from customer service, which isn’t ideal. For support, your best bet is to contact Klein Tools directly through their website if you run into a hardware defect.
- WIFI CONNECTIVITY: Wireless borescope transmits video and images directly...
- COMPACT 5.5MM CAMERA: High-quality inspection camera provides clear visual...
- 5-FOOT WATERPROOF CAMERA: Durable IP67-rated camera with high-flex snake...
Frequently Asked Questions
Is the Klein Tools ET21 really waterproof?
Yes, it has an IP67 rating, which means it’s fully protected against dust and can be submerged in up to 1 meter of water for 30 minutes. I used it in a wet sink drain without any issues. This makes it safe for plumbing inspections, but I wouldn’t recommend leaving it submerged for long periods.
What’s the actual video quality like?
The video capture resolution is 480p. In practice, the image is clear enough to identify blockages, wires, or general problems inside a wall or pipe. However, it’s not high definition. Fine text or very small details might be hard to make out, which is the trade-off for the wireless convenience.
How long is the cable and can I get a longer one?
The model I tested has a 5-foot (1.5-meter) high-flex snake. Klein Tools does offer a 6-foot armored version as a separate purchase. For most household jobs like under sinks or behind appliances, 5 feet is sufficient, but for deeper inspections like long drain lines, you might wish for more length.
Does it work with both iPhone and Android?
Absolutely. You just download the free “Klein Tools ET21” app from the Apple App Store or Google Play Store. I tested it on both types of phones and the connection process was identical and quick. The app is basic but lets you view, save, and share your inspection media.
Is this good for professional use?
It depends on the profession. For a pro who needs crystal-clear documentation, the 480p video might be a limitation. For a tradesperson who just needs to quickly verify something before taking action, it’s a handy and reliable tool to have in the bag. The build quality is definitely professional-grade.
What comes in the box?
You get the main unit with the 5.5mm camera and 5-foot snake, a magnetic tip and side-view mirror attachment, and a hook tool. There’s no bulky screen or battery pack since it uses your phone. You’ll need to provide your own smartphone and likely a USB charger to power the borescope itself.
My Final Verdict
After testing it, I think the Klein Tools ET21 WiFi Borescope is a very solid tool for its intended user. The wireless connection up to 30 feet is genuinely useful, the 5.5mm IP67-rated camera is tough and waterproof, and the app is simple. I’d confidently recommend it to DIYers and homeowners for basic inspections. I would not recommend it to professionals who need HD video or anyone who regularly needs more than the 5-foot cable length.
The 480p resolution is its biggest compromise. You trade off high-definition clarity for the convenience of a wireless, durable tool from a trusted brand. For me, that trade-off is worth it because identifying a problem is more important than filming it in perfect detail. If that sounds like your use case, this is a great pick.
Ready to Check the Price?
If you need a reliable, wireless inspection camera for household tasks, the Klein Tools ET21 is definitely worth a closer look.
As an Amazon Associate I earn from qualifying purchases at no extra cost to you.