Pro mini OTDR Fiber Optic Reflectometer with 9 Functions VFL OLS OPM Event Map 24dB for 64km Fiber Cable Ethernet Tester


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MAY400D MINI PRO Multi-functional OTDR integrates fiber cable and Ethernet cable testing in one unit. It is a powerful tester for installers of fiber cable and network cable.


  • Integrated design, smart and rugged
  • FC/SC connectors interchangeable
  • Automatic and manual test function
  • Visual Fault Locator (VFL) function
  • OTDR Viewer software for data analysis


  • CATV network testing
  • Access network testing
  • LAN network testing
  • Laband Factory testing
  • Live fiber troubleshooting
  • FTTA troubleshooting

2. Optical Power Meter (OPM)
3. Optical Light Source (OLS)
4. Visual Fault Locator (VFL)
Visual Fault Locator uses red laser of 650nm to locate broken fiber point and test fiber continuity.
5. Event Map
Event Map is similar to EXFO’s iOLM function, which can display events in user-friendly icons.
6. RJ45 Sequene, Length and Tracker
It can check wire map, measure the length of RJ45 cable, and trace and locate the RJ45 network cable.
7. Flashlight
8. Report Print
PC software helps print out OTDR test reports.



Model MAY400D
Wavelength 1310/1550nm±20nm
Dynamic Range① 24/22dB
Fiber Type SMF
Event Dead Zone② 3m
Attenuation Dead Zone 8m
Measurement Range 0.5~64km
Measurement Pulse Width 3ns, 5ns, 10ns, 20ns, 30ns, 50ns, 80ns, 160ns
Ranging Accuracy ±(1+Sampling interval+0.005%*Test distance)
Loss Precision ±0.2dB/dB
Sampling Resolution 0.05~8m
Samping Points 16~128K
File Format SOR standard file format
Laser Safety Level Class II
Adapter FC (Interchangeable SC adapter)
Reflection Accuracy ±3dB
Language Chinese, English, Russian, Portuguese, Spanish, French, Korean, Vietnamese (Select one or two languages)


①Testing temperature is 25°C±2°C, maximum pulse width, average time is more than 3 minutes.
②Test conditions of Event Dead Zone are minimum range, minimum pulse width, reflection loss of optical fiber end surface (>45dB), typical value.

2. Optical Power Meter

Wavelength Range (±20nm) 800~1700nm
Calibrated Wavelength 850/980/1300/1310/1490/1550/1625/1650nm
Test Range -50~+26dBm
Resolution 0.01dB
Uncertainty ±5%
Frequency Identification CW/270/330/1k/2kHz
Connector Universal 2.5mm (FC/SC/ST)

3. Optical Light Source

Emitter Type FP-LD
Working Wavelength 1310/1550nm±20nm
Output Power ≥-5dBm
Modulation Frequency 270/330/1k/2kHz
Accuracy CW, ±0.5dB/15min (Test after 15 minutes of preheating)
Connector FC (Interchangeable SC adapter)

3.1. The wavelength of Optical Light Source is the same as OTDR wavelength.
3.2. Optical Light Source shares the same fiber port as OTDR port.

4. Visual Fault Locator

Wavelength (±20nm) 650nm
Power ≥10mW
Mode CW/1Hz/2Hz
Connector Universal 2.5mm (FC/SC/ST)

5. RJ45 Sequene, Length and Tracker

Test Range 300m

Other Specification:

Display 3.5 inch color LCD
Power Supply AC/DC adapter: AC: 100~240V, 5V, 2A; Lithium battery: 3.7V 4000mAh
Battery Standby Life ≥20h
Battery Working Hours ≥12h
Communication Micro USB
Data Storage Internal: 600 curves; External: TF card
Weight 0.35kg
Size 173*82*37mm
Operating Temperature -10 ~ +50°C
Storage Temperature -40 ~ +70°C
Relative Humidity < 95% Non-condensation
Warranty 2 years

Standard Accessories:

Item Name Quantity
1 OTDR with FC Adapter 1pc
2 AC/DC power adapter 1pc
3 CD (including simulation analysis software) 1pc
4 Data line 1pc
5 SC adapter for OTDR port 1pc
6 User manual 1pc
7 Calibration Certificate 1pc
8 Carrying bag 1pc
9 Warranty Card 1pc
10 Network Cable Tracker 1pc

Ordering Information:

Model MAY400
Connector None: FC/UPC and SC/UPC (default)
Weight 1.5 kg
Dimensions 24 × 14 × 12 cm
OTDR Port:



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