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Ships within 48 hours · Estimated delivery Jul 13 - Jul 18
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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
4.8 ★★★★★
Based on 2167 reviews
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Product Reviews
★★★★★ 4
Surprising quality for such a cheap item
Size: 4X-Large Big Tall, Color: Navy White Diamond Geo
Surprisingly good fit. The material is a bit thin and if you're wearing it on a cold day, I would recommend an undershirt. The collars could use a good starching for a more modern look. As it stands with an open jacket, the large collar makes it look a little dated. If you have 20 dollars and need a shirt you could certainly do worse.
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Reviewed in the United States on January 17, 2026
★★★★★ 5
Nice
Size: 3X-Large Big, Color: White
Good shirt for price
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Reviewed in the United States on April 24, 2026
★★★★★ 3
Good, but could be better!
Size: Medium, Color: Lavender White Windowpane, Size: Medium, Color: Lavender White Windowpane
+ 3 ⭐⭐⭐ I honestly didn’t expect much at this price it's a good value for money & only if you pay the very discounted price ~$7 or ~$9, The fabric is of good quality feels soft and comfortable right out of the package, with just enough stretch to move around easily during the day. It’s light, breathable, and doesn’t feel stiff like some cheaper dress shirts tend to do.
The wrinkle resistant feature actually works only on paper, wrinkle resistant is only a slab of steel or rubber, though after a good steam iron it keeps the shape for a while. After a quick wash and dry, it came out looking presentable without needing much ironing, which is a huge win for busy mornings. The regular fit M is true to size and gives a clean, relaxed look without feeling boxy or too tight. I wore it to work and later out for dinner, and it still looked sharp by the end of the day. Love the Lavender White Windowpane color it is subtle & stylish. It adds a little personality while still being professional. The stitching and buttons feel solid, and after washing, the shirt held its shape and color well.
- 2 ⭐⭐ Here is the big critic, I liked the shirt, but it came stained there is a big stain on a sleeve, & I am not sure if it will come off, this is the second on I ordered because the first one was also stained, it seems like some oil or rust ingrained into the fabric, I can understand the first shirt was "used like new", but the second one supposed to be new, yet it is stained, a lot of loose threads, weird seams and stains. As I said this shirt justifies itself only at the discounted price.
I did my best to show it in pictures, alas not the way I wanted, it is more visible in person.
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Reviewed in the United States on December 28, 2025
★★★★★ 1
disappointing... buyer beware
Size: XX-Large, Color: Lavender White Windowpane
careful there is no pocket? what kind of essential long sleeve shirt arrives without a pocket? I took to the cleaners to have pressed, and just got it back today. so I missed the return window. I am disappointed, and a bit frustrated, it's never been worn and will not be without a pocket....
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Reviewed in the United States on June 4, 2026
★★★★★ 5
Great value
Size: XX-Large, Color: Navy White Diamond Geo
Nice shirt for the price. Needed a budget shirt to wear with a suit and this fit the bill. Fits well. Is a little thin, you can see through it if not wearing an undershirt.
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Reviewed in the United States on December 27, 2025