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Description
Optical Variable Attenuator EVA50-40Most compact and rugged portable attenuator on the market Three wavelengths: 1310nm 1490nm 1550nm Different attenuator range, 40dB, 60dB or 80dB Can save current value as reference Can save 10 tracks attenuation value Memorize the value after instruments shut down Energy save mode One year warranty and Three year recommended calibration interval Model EVA50 40 EVA50 60 EVA50 80 Attenuating Range 40 dB (SM) 60 dB (SM) 80 dB (SM) Calibrated Wavelengths
Most compact and rugged portable attenuator on the market
Three wavelengths: 1310nm / 1490nm / 1550nm
Different attenuator range, 40dB, 60dB or 80dB
Can save current value as reference
Can save 10 tracks attenuation value
Memorize the value after instruments shut down
Energy save mode
One-year warranty and Three-year recommended calibration interval
| Model | EVA50-40 | EVA50-60 | EVA50-80 |
| Attenuating Range | 40 dB (SM) | 60 dB (SM) | 80 dB (SM) |
| Calibrated Wavelengths | 1310nm / 1490nm / 1550nm | ||
| Fiber Mode | SM | ||
| Attenuating Mode | Digital | ||
| Display Resolving Power | 0.1dB | ||
| Display | LCD, 128*64 | ||
| Max Input Power | + 21 dBm | ||
| Return Loss* | 40 dB | ||
| Insertion Loss* | 2.5 dB | ||
| Connector | FC/PC (or customize) | ||
| Uncertainty | ± 0.5 dB | ||
| Repeatability* | ± 0.2 dB | ||
| RS-232 | Optional | ||
| Auto Power Off | No operation in 10 minutes (can be canceled), Low battery energy | ||
| Battery Charge | Yes | ||
| Operate Time | Above 20 hours | ||
| Power Supply | 3 * AA batteries or AC/DC adapter | ||
* at 20±3℃, CW, with FC/PC connector,1550nm
| Size(H*W*D) | 190mm * 90mm * 40mm | |
| Weight/td> | About 450g | |
| Storage Temperature | -20 -- +60°C, < 90%RH | |
| Operating Temperature | -10 -- +50°C, < 90%RH | |
EVA50-XX
Model
EVA50-40 = 40dB
EVA50-60 = 60dB
EVA50-80 = 80dB
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
4.7 ★★★★★
Based on 13 reviews
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Product Reviews
★★★★★ 5
Duke proof!
Set name: DinoBone 2-Pack XL
These toys are great for my puppy. He’s an aggressive chewer and these are standing up to his test!
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Reviewed in the United States on May 22, 2026
★★★★★ 5
Durable
Set name: DinoBone 2-Pack XL
Very durable. My dog has been chewing on it for a week and it still looks almost new.
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Reviewed in the United States on May 17, 2026
★★★★★ 5
My dog likes them
Color: brown
Dogs play with these and chew on them
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Reviewed in the United States on June 12, 2026
★★★★★ 5
Highly recommended for any owner of a "Super Chewer."
Rating: ⭐⭐⭐⭐⭐ (5/5)
Title: Finally, toys that can actually withstand my Labrador’s jaws!
If you own a "power chewer," you know the struggle: you bring home a new toy, and within ten minutes, it’s shredded into a thousand pieces of foam and plastic. After going through countless toys that promised durability but failed within a day, I decided to give the WOWBALA 2-Pack Indestructible Dog Toys a try—and I am genuinely impressed.
The Durability Factor
The biggest selling point here is the material. These are made from high-density, food-grade nylon, and you can feel the quality the moment you take them out of the package. They are solid, heavy-duty, and have held up perfectly against my Lab’s relentless chewing. Even after a week of heavy use, there are only minor surface marks where his teeth have made contact, rather than the dangerous chunks that usually break off other toys.
Design & Engagement
The pack comes with two different shapes—a stick and a ring—which is a great variety. The curved, ergonomic design of the stick makes it very easy for my dog to hold between his paws while he chews, and the textured surface seems to really hit the spot for him. I’ve also noticed that it helps keep his breath fresh and his gums healthy since the texture acts almost like a toothbrush while he plays.
The "Milky" Scent
One thing I was initially skeptical about was the "milky scent." I wondered if it would be overpowering, but it’s actually quite subtle. It was strong enough to immediately pique my dog’s curiosity right out of the box, but it doesn't leave a weird smell on my carpet or hands. It’s clearly effective, as he keeps coming back to these toys even when he has others scattered around the room.
Peace of Mind
Beyond just being tough, I appreciate that they are non-toxic and dishwasher safe. After a long day of outdoor play in the mud, being able to just toss these into the dishwasher and have them come out clean and sanitized is a huge convenience.
Final Verdict
If you have a medium to large breed dog that loves to destroy everything in sight, these toys are well worth the $15.99 investment. It’s rare to find a product that lives up to the "indestructible" label, but these truly do. They’ve been a lifesaver for keeping my dog occupied while I’m working from home, and it’s a relief not having to play "clean up the debris" every evening.
Pros:
Extremely durable high-density nylon.
Great value (2-pack).
Easy to clean (dishwasher safe).
Engaging design for teething, training, and boredom relief.
Safe and non-toxic.
Cons:
Because they are hard nylon, be careful using them indoors on hardwood floors—they can be a bit noisy when dropped!
Highly recommended for any owner of a "Super Chewer."
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Reviewed in the United States on May 19, 2026
★★★★★ 5
These are way better than I expected and hold up to our aggressive chewer spectacularly!
I got these specifically for our newest pup (an 8 month old lab/pitbull mix--she's a big puppy, lol) who is obsessed with toys and chewing. She has a tendency to go through her toys quick, both chew toys and soft ones, so I wanted something that would last a bit longer for her because I can tell she gets a bit sad when we have to trash one that's hit its lifespan. So far, these have been a big hit! They're the perfect size for her to pick up, the chicken claw-style texture is great for both keeping her interested and giving her some grabbing options, and they do seem to hold up to their claim of being made for aggressive chewers! There's obviously some wear, but it looks like expected chew toy wear; no claws have snapped off, and her chew marks look relatively minimal compared to what she's done to other chews. I also appreciate that these came in a two pack; we have a smaller dog, and while these are technically big for him, he enjoys having one to play with and chew on as well. These have been a pleasant surprise and I actually think I'll come back to buy them again whenever they're spent! Definitely a worthy purchase!
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Reviewed in the United States on June 2, 2026
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