---
product_id: 66486938
title: "LC/UPC Duplex SM(9/125) Fiber Optic Loopback Module Connector Tester Adapter"
brand: "jeirdus"
price: "$32.51"
currency: USD
in_stock: true
reviews_count: 7
category: "Jeirdus"
url: https://www.desertcart.us/products/66486938-lc-upc-duplex-sm-9-125-fiber-optic-loopback-module
store_origin: US
region: United States of America
---

# 45~60 dB return loss ≤0.10 dB repeatability ≤0.20 dB insertion loss LC/UPC Duplex SM(9/125) Fiber Optic Loopback Module Connector Tester Adapter

**Brand:** jeirdus
**Price:** $32.51
**Availability:** ✅ In Stock

## Summary

> 🔍 Diagnose like a pro — never miss a network glitch again!

## Quick Answers

- **What is this?** LC/UPC Duplex SM(9/125) Fiber Optic Loopback Module Connector Tester Adapter by jeirdus
- **How much does it cost?** $32.51 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/66486938-lc-upc-duplex-sm-9-125-fiber-optic-loopback-module)

## Best For

- jeirdus enthusiasts

## Why This Product

- Trusted jeirdus brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Consistent Performance:** Repeatability within ≤0.10 dB guarantees reliable, repeatable test results every time.
- • **Durable Ceramic Sleeve:** Robust ceramic sleeve connection enhances longevity and stable fiber alignment.
- • **Precision Signal Integrity:** Ultra-low insertion loss (≤0.20 dB) ensures crystal-clear loopback testing.
- • **Superior Network Isolation:** High return loss (45~60 dB) minimizes signal reflection for accurate diagnostics.
- • **Effortless Duplex Connectivity:** Duplex clips secure connectors firmly, simplifying insertion and boosting testing accuracy.

## Overview

The LC/UPC Duplex SM(9/125) Fiber Optic Loopback Module is a precision-engineered adapter designed for fiber optic testing and network troubleshooting. Featuring ultra-low insertion loss, high return loss, and exceptional repeatability, it ensures accurate signal loopback for isolating network issues. Its durable ceramic sleeve and duplex clip design provide secure, reliable connections, making it an essential tool for network professionals seeking flawless diagnostics.

## Description

Fiber Loop back is designed to provide a media of return patch for a fiber optic signal; typically it is used for fiber optic testing applications or network restorations. For the testing applications, the loopback signal is used for diagnosing a problem. Sending a loopback test to network equipment, one at a time, is a technique for isolating a problem.

Review: The reviews and ratings for the traders - Great product. Exactly as described and ideal for me.
Review: Don't bother - It comes apart too easily and gives high readings. I've binned it

## Features

- LC/UPC Duplex SM(9/125) Fiber Optic Loopback
- Insertion loss ¡Ü 0.20 dB,Return loss 45~60 dB,Repeatability ¡Ü 0.10 dB,Changeability ¡Ü 0.20 dB,This adapters uses ceramic sleeve to connect between two SC fiber Optic cables.
- Fiber Optic Loopback Cables provide a return signal for fiber optic equipment which can be using for tesing purposes and isolating any network issues
- 100% Functionally tested before shipping,Ease and accuracy of insertion as duplex clips hold connectors togethe

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B07DG3PLP1 |
| Best Sellers Rank | 59,082 in Electronics & Photo ( See Top 100 in Electronics & Photo ) 287 in Fibre Optic Cables |
| Guaranteed software updates until | unknown |
| Item model number | FBM-HLQ-SLC |
| Manufacturer | Jeirdus |
| Product Dimensions | 1 x 1 x 1 cm; 10 g |

## Product Details

- **Brand:** Jeirdus
- **Cable type:** Fibre Optic
- **Compatible devices:** Modem
- **Connector type:** lc
- **Special feature:** Data Transfer

## Images

![LC/UPC Duplex SM(9/125) Fiber Optic Loopback Module Connector Tester Adapter - Image 1](https://m.media-amazon.com/images/I/316UoSG007L.jpg)
![LC/UPC Duplex SM(9/125) Fiber Optic Loopback Module Connector Tester Adapter - Image 2](https://m.media-amazon.com/images/I/31soVP4QDAL.jpg)
![LC/UPC Duplex SM(9/125) Fiber Optic Loopback Module Connector Tester Adapter - Image 3](https://m.media-amazon.com/images/I/31yy9n-CYiL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ The reviews and ratings for the traders
*by P***R on 29 June 2019*

Great product. Exactly as described and ideal for me.

### ⭐ Don't bother
*by P***L on 27 October 2020*

It comes apart too easily and gives high readings. I've binned it

### ⭐⭐⭐⭐⭐ Review
*by A***R on 13 August 2025*

Great I used this before on a fiber connection

## Frequently Bought Together

- Jeirdus LC/UPC Fiber Optic Loopback Duplex SM 9/125 Module Connector Tester Adapter
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- Visual Fault Locator 30KM, VFL Fiber Optic Tester Kit - Include Single Mode 9/125um FC Male to LC Female Adapter, Light Pen for Fiber Network Cable Test

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*Product available on Desertcart United States of America*
*Store origin: US*
*Last updated: 2026-02-01*