How does it see polarity?

In terms of polarity, there is no “+” or “-“ as with electrical current. There is only direction of light flow. The tester itself will indicate if there is light flow in a strand and from which direction.

can't i just use my phone's camera to check for light coming from transceiver? how is this better?

Camera on a phone works great, most of the time. However, here is why I tend to use the FiberLert - I struggle to see dim 850nm light and often fail to detect 1300nm or 1550nm light ... perhaps this tells you more about my aging eyes or the quality of the camera on my phone ... but that's my experience - In tight spaces, I can maneuver the FiberLert into a place where I cannot fit a camera - I appreciate the ease and speed of mating the FiberLert with the patch cord or bulkhead connector along with the combination of the blinky light plus the audible beep, announcing the presence of light -- fast feedback, as compared to positioning the camera, angling it appropriately, and then staring intently to detect the light That being said, camera on the phone works most of the time

Fully operational. Shipping worldwide, on schedule.Duty & taxes paid at delivery

Help Track order

Account Cart

Fully operational. Shipping worldwide, on schedule.Duty & taxes paid at delivery

Help Track order

Account Cart

FIBERLERT-125 - Single Pack

Product ID: 556201911

Details

Brand
Fluke Networks
Colour
Yellow
Item weight
0.22 Ounces
Power source
Battery
Style
Modern Compact

📡Detects 850-1625 nm fiber wavelengths

🔋5-min auto power-off for battery saving

🛠️Non-contact detection for SM/MM, UPC/APC

€ 332.12

Duties & taxes included

In stock

Sold byAmazon CroatiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Croatia.

Secure transaction

Description

🚦 Light up your fiber game—detect signals in a flash!

BATTERY SMART TECH - Auto shutoff after 5 minutes extends 2xAAA battery life
COMPACT PORTABLE - Pocket-sized design fits perfectly in your toolkit or pocket
UNIVERSAL COMPATIBILITY - Works seamlessly with single-mode, multimode, UPC, and APC fibers
VISUAL AUDIBLE ALERTS - LightBeat LED flashes and sound indicators keep you informed on the go
INSTANT FIBER SIGNAL DETECTION - No setup needed—light & sound confirm activity immediately

The Fluke Networks FIBERLERT-125 is a compact, battery-powered live fiber detector that instantly verifies optical signals across single-mode and multimode fibers (850-1625 nm). Featuring non-contact detection for UPC and APC connectors, it uses light and sound alerts with a LightBeat LED indicator and smart auto power-off to maximize battery life, making it an essential tool for fiber professionals on the move.

Specifications

ASIN	B09KZV7V2J
ASIN	B09KZV7V2J
Batteries	2 AAA batteries required. (included)
Best Sellers Rank	#87,179 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #419 in Multi Testers
Brand Name	Fluke Networks
Color	Yellow
Customer Reviews	4.7 4.7 out of 5 stars (171)
Customer reviews	4.7 4.7 out of 5 stars (171)
Date First Available	16 August 2023
Included Components	Fluke FIBERLERT
Item Dimensions	16.8 x 1.5 x 2.5 centimeters
Item Type Name	test and measurement tools
Item Weight	0.22 Ounces
Item model number	FIBERLERT-125
Manufacturer	Fluke Networks
Manufacturer	Fluke Networks
Measurement Type	Optical Power
Model	FIBERLERT-125
Part Number	5317262
Power Source	Battery Powered
Product Dimensions	16.76 x 1.52 x 2.54 cm; 6.24 g
Specification Met	CE
Style Name	Modern, Compact
UPC	195112035665
Upper Temperature Rating	50 Degrees Celsius

Common Questions

Are the products genuine and authentic?+

Yes, all products are sourced directly from authorized retailers in the US, UK, UAE and India. We maintain strict quality control processes and verify each product before shipping. All items come with applicable manufacturer warranties and are covered by our standard return policy.

How long does delivery take and is it reliable?+

Delivery times vary by destination country, typically ranging from 3-9 business days. Each order is fully trackable through our system. We handle all customs clearance and use reliable courier partners for last-mile delivery. You'll receive regular updates about your order status via email and our app.

What is Desertcart? Is it safe to order from?+

Desertcart is an international e-commerce platform operating since 2014. We securely process thousands of orders globally each day. Every product goes through our quality verification process before delivery, and we provide end-to-end order tracking, 24/7 customer support, and a comprehensive returns policy to ensure a safe shopping experience.

How is product pricing calculated?+

Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Ali H.

Fast shipping and excellent packaging. The Leatherman tool feels very premium and sturdy.

1 day ago

Anita G.

Good experience, but the tracking updates could be better.

2 months ago

View all Trustpilot reviews

Shop Global, Save with Desertcart

Value for Money

Competitive prices on a vast range of products

Shop Globally

Serving millions of shoppers across more than 100 countries

Enhanced Protection

Trusted payment options loved by worldwide shoppers

Customer Assurance

Trusted payment options loved by worldwide shoppers.

Desertcart App

Shop on the go, anytime, anywhere.