This family of bidirectional Optical Loss Test sets (OLTS) with optional length measurement, is perfect for medium to ultra-high fiber count loss & length testing up to 6 λ. A pair of compact instruments set new standards of productivity, accuracy, and ease of use.

Each fiber needs just one test hook-up and one key press for a complete bidirectional loss & length test, The same test method is used for for both single-mode and multimode fiber, eliminating administration, training, and test errors. Testing is accurate and can take only 5 seconds, direct onto flexible standards-compliant Tier 1 certification reports. The Visitester option lights up the far end of the fiber to be tested.

Both instruments display length as well as bi-directional loss and optical return loss each end, in real time, with no need to specify master/slave instruments. A single instrument can also be used as a stand-alone light source & power meter, VFL, or tone generator / detector. 

  • 25% of the size / weight, 7x the battery life of competitors 
  • SM, MM, quad & other wavelengths
  • Bidirectional Autotest loss, ORL & length testing on one fiber
  • Real time Pass / Fail display
  • 8,000 fiber memory and USB key file dump
  • KITS™ reporting software
  • Autotest optical power meter, >25 λ, 1 % accuracy
  • Traceable reports: source stability & λ, meter cal & linearity
  • 80 hr alkaline battery life
  • 3 Year warranty and calibration cycle
  • EF compliant multimode sources

Please enquire for other configurations to match your needs.

Part Number Details

Part Number Description + Application MSRP*
850-1300 nm, 1310-1550 nm, InGaAs
USD $6237.30
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850-1300 nm, 1310-1550 nm APC, InGaAs
USD $6242.03
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Length VisiTester, 850-1300 nm, 1310-1550 nm, InGaAs
USD $7144.89
In Stock
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Length VisiTester, 850-1300 nm, 1310-1550 nm APC, InGaAs
USD $7144.89
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Length, 850-1300 nm, 1310-1490-1550-1625 nm Laser APC, InGaAs
USD $7244.73
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Length VisiTester, 850-1300 nm, InGaAs
USD $4455.71
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Length VisiTester, 1310-1550 nm, InGaAs
USD $5643.91
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Length VisiTester, 1310-1550 nm, InGaAs, APC
USD $5645.02
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1310-1550-1625 nm APC, InGaAs
USD $5553.49
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Length VisiTester, 1310-1550-1625 nm APC, InGaAs
USD $6149.28
In Stock
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Length VFL,1310-1490-1550-1625 nm Laser APC, InGaAs
USD $6241.68
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Not sure? Make a general enquiry.

Key Features


General Two-Way Loss / Length Test Set KI 27400 Series specifications

For more detailed specifications, please select a specific part number from the parts & stock section.

Detector type (meter) InGaAs
Response wavelength (meter) 600 ~ 1700 nm
Calibration wavelengths (meter) 780, 820, 850, 980, 1270, 1290, 1300, 1310, 1330, 1350, 1370, 1390, 1410, 1430, 1450, 1470, 1490, 1510, 1530, 1550, 1570, 1590, 1610, 1625, 1650 nm
Power range (meter) +10 ~ -60 dBm (780 ~ 980, 1590 ~ 1650 nm) / +10 ~ -70 dBm (1270 ~ 1650 nm)
Accuracy (meter) 1 % (0.06 dB)
Mid-range linearity (meter) 0.04 dB (typical)
Total uncertainty (meter) 0.3 dB (max)
ID tone detection & Autotest sensitivity (meter) Up to -50 dBm
Resolution (meter) 0.01 dB
Polarization sensitivity (meter) < 0.05 dB (typical)
Tone detection (meter) 150 ~ 9999 Hz ± 1 %
Autotest 1-way: compatible with other KI23400 & KI27400 models / 2-way: compatible with identical model only
USB interfaces USB-micro for power & software / USB-A for memory key
Software KITS (free download)
Power Battery / External power via USB
Battery life Laser/LED source: 80 hours (typical) in Autotest, Power Meter: 1000 hours (typical)
Battery type 2x AA (LR6) Alkaline / 2x AA NiMH AA (rechargeable via USB)
Auto off Selectable
Display 74 mm x 55 mm high contrast LCD
Case Polycarbonate (body) / rubber (edges & corners), moisture resistance, 1-meter drop tested
Memory For 8,000 fibers / Unlimited on USB
Size 190 mm x 105 mm x 35 mm
Unit weight 0.42 kg
Shipping weight 1.5 Kg
Operating / storage temperature -15 to 55 °C / -25 to 70 °C
Relative humidity 0 ~ 95 %
Warranty 3 years
Calibration validity (ISO17025) 3 years

Documentation & Support

In the box


LC Hybrid Connector Adapter OPT076

LC Simplex, metal body.


Padded Canvas Carry Pouch OPT149

Soft pouch with carry straps and compartments for accessories storage, able to carry 2x KI2000 series-size instruments.

Software (KITS)

Software (KITS)

Downloadable from Kingfisher's website for free.

Optional accessories


Semi-Rigid Carry Case for Test Kits OPT153-CASE

Canvas case with foam compartments for 2x KI2000 or KI7000 series instrument, 3x KI9000 series instrument and other accessories.

USD $285.84

In stock
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Semi-Rigid Carry Case for Test Kits OPT154B

Content: 1x Case (OPT154B-CASE) (suitable for 2x KI2000 series instrument, 1x Microscope, 1x VFL, Accessories); 5x 2.5mm Fiber Conn Cleaning Sticks; 5x 1.25mm Fiber Conn Cleaning Sticks; 1x Blower Brush (TOOL CLEAN-01A); 1x Fiber Conn Cleaning Cartridge(TOOL CLEAN-09A).

USD $425.54

In stock
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