MAY408 Mini OTDR

MAY408 Mini OTDR - Front View
MAY408 Mini OTDR - Back View
MAY408 Mini OTDR - Side View
MAY408 Mini OTDR - Optical Ports

Black housing

FC Adapter for OTDR

FC Adapter for OTDR Port (Standard)

SC Adapter for OTDR

SC Adapter for OTDR Port (Standard)

MAY408 Mini OTDR - Standard Accessories

Standard Accessories

LC Adapter for OTDR

LC Adapter for OTDR Port (Optional)  

ST Adapter for OTDR

ST Adapter for OTDR Port (Optional)

MAY408 Mini OTDR integrates fiber cable and Ethernet cable testing in one unit. It is a powerful tester for installers of fiber cable and network cable.
MAY408 Mini OTDR is mainly used to measure the length, loss, average loss, return loss, connection quality, etc. of various fiber optic cables. It has automatic optical protection function to prevent damage to the optical module.


  • Support screen capature
  • Integrated design, smart and rugged
  • FC/SC/ST connectors interchangeable
  • Automatic and manual test function
  • OTDR Viewer software for data analysis
  • Cover plate type tempered glass panel, no worry about screen scratch
  • Sink type optical port design for better protection
  • Support U disk and SD card export data protection
  • Minimum measurement: 2.5 m


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


  1. OTDR
  2. Optical Power Meter (OPM)
  3. Visual Fault Locator (VFL)
    Visual Fault Locator uses red laser of 650nm to locate broken fiber point and test fiber continuity.
  4. Optical Light Source (Laser Source)
  5. RJ45 Test
    It can check RJ45 Ethernet Cable Sequence
  6. RJ45 Tracker
    It can trace and locate the RJ45 network cable. Network Cable Tracker should be purchased separately.
  7. Event Map
    Event Map is similar to EXFO’s iOLM function, which can display events in user-friendly icons.
  8. Loss Testing
    OPM and OLS can be opened at the same time to test insertion loss.
  9. Report Print
    PC software helps print out OTDR test reports.
  10. LED light
Model MAY408-D24 MAY408-MD24
Wavelength 1310/1550nm 850/1300nm
Dynamic Range① 24/22dB 20/24dB
Fiber Type SMF MMF
Event Dead Zone② 2.5m 3.5m
Attenuation Dead Zone 8m 10m
Measurement Range 100m, 500m, 1km, 2km, 5km, 10km, 20km, 40km, 60km, 90km
Measurement Pulse Width SM: 5ns, 10ns, 20ns, 50ns, 100ns, 275ns, 500ns, 1us, 2us, 5us, 10us MM: 5ns, 10ns, 20ns, 50ns, 100ns, 275ns, 500ns, 1us, 2us
Ranging Accuracy ±(1m+Sampling interval+0.005%×measuring range
Sampling Resolution Minimum 0.2m
Sampling Points 20,000 points Max.
Linearity ±0.2dB/dB
Loss Threshold 0.01dB
Loss Resolution 0.001dB
Range resolution 0.001m
Refraction Setting 1.0000~2.0000
Reflection accuracy ±3dB
File Format SOR standard file format
Laser Safety Level Class 3B
Adapter FC (Interchangeable SC adapter)
Language English, Spanish, Russian, French, Portuguese, Vietnamese, Korean, German, Thai, Traditional Chinese
Note: 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 850/1300/1310/1490/1550/1625/1650nm
Test Range Type A: -70~+10dBm (default); Type B: -50~+26dBm (optional)
Resolution 0.01dB
Uncertainty ±5%
Frequency CW/270Hz/330Hz/1kHz/2kHz
Connector Universal 2.5mm (FC/SC/ST)
3. Optical Light Source
Emitter Type FP-LD
Working Wavelength Same as OTDR
Output Power -5dBm±2dB (Adjust)
Modulation Frequency CW/270Hz/330Hz/1kHz/2kHz
Accuracy ±5%
Connector FC (Interchangeable SC adapter)
  • The wavelength of Optical Light Source is the same as OTDR wavelength.
  • Optical Light Source shares the same fiber port as OTDR port.
4. Visual Fault Locator
Wavelength (±20nm) 650nm
Power ≥10mW
Mode CW/2Hz
Connector Universal 2.5mm (FC/SC/ST)
5. RJ45 Sequene
Test Range 300m
Other Specification:
Display 4.3 inch full-view capacitive touch screen, support multi-touch, TFT 800×480 resolution
CPU Frequency 180MHz
Power Supply AC/DC adapter: AC: 100~240V, 50/60Hz, 5V, 1A; Lithium battery: 3.7V 5,200mAh
Battery Standby Life ≥15h
Battery Working Hours ≥8h (backlight off)
Battery Charging Time 3 hours with power adapter; 10 hours with USB cable
Data Interface 2×USB (Type C×1, USB×1), SD card (optional)
Data Storage Internal: 1,000 curves
Weight 520g (including battery)
Size 175*105*45mm
Operating Temperature -10 ~ +50°C
Storage Temperature -40 ~ +70°C
Relative Humidity < 90% Non-condensation
Standard Accessories:
Item Name Quantity
1 OTDR with FC adapter for OTDR/LS port, Lithium battery and Simulation analysis software 1pc
2 AC/DC power adapter 1pc
3 Data line 1pc
4 SC Adapter for OTDR port 1pc
5 User manual 1pc
6 Calibration Certificate 1pc
7 Soft Bag with shoulder strap 1pc
8 Remote module for Network Cable Test (for RJ45 Test Function) 1pc
9 Wrist belt 1pc
Optional Accessories:
Item Name Quantity
1 LC Adapter for OTDR port 1pc
2 ST Adapter for OTDR port 1pc
3 Network Cable Tracker (for RJ45 Tracker Function) 1pc
4 SD Card 1pc
Ordering Information:
Model MAY408
Wavelength and Dynamic Range D24: 1310/1550nm, 24/22dB
MD24: 850/1300nm, 20/24dB
Power Meter A: -70~+10dBm (default)
B: -50~+26dBm
Connector None: FC/UPC and SC/UPC (default)
Note: OTDR’s outer housing color option: white or black.
Difference between MAY420 and MAY408 OTDR:
  1. MAY420 is based on ARM Cortex A8 processor, while MAY408 is based on ARM Cortex M4 processor.
  2. The CPU Frequency of MAY420 is 1GHz, while that of MAY408 is 180MHz.
  3. MAY420 does not support internal memory, while MAY408 supports internal memory of 1,000 curves.
  4. MAY420 does not support multi-touch, while MAY408 supports it.
  5. MAY420 supports micro USB, while MAY408 support Type C.
  6. MAY420 support optional Fiber Endface Inspection, while MAY408 does not support it.
  7. MAY420 does not support RJ45 Tracker, while MAY408 supports it.