High Reliability LUX METER Series, Complies with DIN Class B, Compatible with LED/OLED Lighting

The FT3425 is a light meter designed for an extensive range of applications involving illumination equipment, lighting work and facility management. Capable of testing even LED lighting, the FT3425 provides five measurement ranges, 20 lx to 200 000 lx, to support a wide range of luminance levels, and comes built in with Bluetooth® wireless technology. Key Features • Measured illuminance data is automatically sent to smartphone or tablet with Bluetooth® wireless technology (FT3425) • Compatible with LED/OLED lighting • Complies with DIN 5032-7:1985 class B and JIS C 1609-1:2006 general AA class • Timer hold function lets you make measurements in remote locations while avoiding the effects of shadows and reflections • Save up to 99 measured values in the instrument’s internal memory and transfer them to a computer later for improved work efficiency • Data can be transferred to tablets and smartphones using Hioki’s dedicated free app "GENNECT Cross".

Model No. (Order Code)

FT3425 Built in Bluetooth(R) wireless technology

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How to Conduct Lighting Inspections: Cut Work-time in Half with Bluetooth Wireless Technology

The Hioki FT3425 Lux Meter is built in with Bluetooth wireless technology, letting you pair it with the free GENNECT Cross mobile app to inspect, record, and create reports of lux data easily and efficiently, dramatically reducing work time. Gone are the issues of not having enough time to test multiple locations or creating accurate reports with a large amount of data.

How to Conduct Lighting Inspections: Using the Extension Cart to Easily Conduct Multi-point Tests

The FT3424 and FT3425 Lux Meters are supported by the Z5023 Extension Cart, which is built with casters to vastly improve the efficiency of making multi-point light inspections. When conducting final building inspections for proper illuminance, normally two inspectors are needed, and one is often required to stand and crouch repeatedly to capture the correct data. The Z5023 significantly saves both time and effort by enabling a single technician to do the job without the physical burdens.

Dramatically reduce illuminance testing work times!

The FT3425 features Bluetooth® wireless technology that can be used with the GENNECT Cross smartphone app to provide robust support for every stage of the illuminance testing process, including taking measurements, recording results, and creating and submitting reports. By saving measured values on a completion drawing that’s been loaded onto your smartphone or a photograph taken with the smartphone’s camera, you can dramatically reduce the amount of time it takes to perform multipoint measurements, for example during completion testing following electrical and lighting work.

Instantly create reports by a free app (GENNECT Cross)

GENNECT Cross, a free app designed specifically for use with Hioki measuring instruments, lets you check and manage measurement results and create reports. The software provides a range of functionality that helps manage data in the field, including photographing measurement sites, placing measurement results on photographs, and saving hand written memos.

Click here for details about GENNECT Cross

Repeated measurements are a breeze since there’s no need to squat down!

The optional Extension Cart Z5023 is equipped with casters, making it easy to move between measurement locations. The ability to move the instrument without squatting down dramatically reduces the physical burden associated with making repeated multipoint measurements.

Measure illuminance free of the effects of shadows

1. Timer hold function Retain the measured value after a user-configured amount of time has elapsed from the time the TIMER key is pressed. In this way, you can time measurement to occur after you have moved away from the lux meter so that measurement is not affected by clothing, shadows, etc. Timer settings: Select from 5 / 10 / 15 / 20 / 30 / 45 / 60 sec. After the set time has elapsed, the measured value is retained. → The backlight turns on and the beep sounds for 3 sec. 2. Measurement with sensor and display units undocked You can undock the display and sensor units for more convenient use. Simply connect them with the Connection Cable L9820 (option).

Support for measurement of 1 lx makes the FT3424 ideal for low-illuminance measurement

20 lx range measurement resolution 0.01 lx

Memory function makes multipoint measurement a breeze

1.Memory function (up to 99 values) Save measured values for multiple measurement locations in the instrument’s internal memory on the spot for later display at your convenience. There’s no need to take time to jot down a reading on paper for each measurement. 2.Data communications functionality Transfer data saved in the instrument’s internal memory to a computer via a USB connection. Data can be saved as a text file.

Basic specifications (Accuracy guaranteed for 2 years, Post-adjustment accuracy guaranteed for 2 years)Only FT3425 is equipped with Bluetooth® wireless technology, others are shared specifications

StandardsDIN 5032-7: 1985 class B, JIS C 1609-1: 2006 general AA class
Light receiving elementSilicon photo diode
Range selectionAuto/ Manual
Linearity±2% rdg. (Multiply by 1.5 for display values in excess of 3000 lx.)
Accuracy guarantee for temperature and humidity21 °C to 27 °C (69.8 °F to 80.6 °F), 75% rh or less (non-condensing)
Response timeAuto range: within 5 seconds, Manual range: within 2 seconds
D/A outputOutput level: 2 V/range f.s. (2.5 V is output when the range f.s. is exceeded.)
Output accuracy: ±1% rdg. ±5 mV (at display count)
FunctionsTimer hold function, Memory function (Up to 99 measured data can be saved.), Hold, Auto power off , Buzzer sound, Backlight, Zero adjustment
InterfacesUSB 2.0 (FT3424/FT3425), Bluetooth® 4.0LE (FT3425 only)
Power supplyLR6 Alkaline battery ×2, Max. rated power 500 mVA, or R6 Manganese battery ×2, or USB bus power (5 VDC)
Continuous battery operation time300 hours (when using LR6 batteries, with Bluetooth® OFF), 80 hours (when using LR6 batteries, with Bluetooth® ON)
Dimensions and mass (including the batteries)78 mm (3.07 in)W × 170 mm (6.69 in)H × 39 mm (1.54 in)D,
310 g (10.9 oz, FT3424) / 320 g (11.3 oz, FT3425)
AccessoriesInstruction Manual ×1, AA/LR6 Alkaline battery ×2, Sensor cap (with strap) ×1, Carrying case (soft) ×1, Strap (for instrument) ×1, USB cable (0.9 m/2.95 ft) ×1, CD (USB driver, dedicated computer application software, and communications specifications) ×1, Precautions Concerning Use of Equipment that Emits Radio Waves ×1 (only FT3425)

Measurement ranges

RangeMeasurement rangeDisplay steps
20 lx0.00 lx to 20.00 lx1 count step
200 lx0.0 lx to 200.0 lx1 count step
2000 lx0 lx to 2000 lx1 count step
20000 lx00 lx to 20000 lx10 count step
200000 lx000 lx to 200000 lx100 count step

Countries and regions where wireless operation is currently supported (FT3425)Last update: May 7, 2021

Countries and regions where wireless operation is currently supportedAustralia, Austria, Belgium, Bulgaria, Canada, Chile, Colombia, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Georgia, Germany, Greece, Hong Kong, Hungary, Iceland, Indonesia, Ireland, Israel, Italy, Japan, Kenya, Korea, Latvia, Liechtenstein, Lithuania, Luxembourg, Macao, Malta, Myanmar, Netherlands, New Zealand, Norway, Peru, Poland, Portugal, Romania, Singapore, Slovakia, Slovenia, Spain, Sweden, Switzerland, Thailand, Turkey, United Kingdom, United States, Viet Nam
NoteUse of devices that emit radio radiation requires approval in the country of use. Thus, use of the instrument in a country or region where they have not been approved may be subject to penalty as a violation of law.

Log into your myHioki account to access more technical documents and information where available.

Seminar Videos On Demand

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Seminar Schedule

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Catalog: LUX METER FT3424, FT3425 Download PDF  [3MB] English
Catalog: GENNECT CROSS SF4071, SF4072 Download PDF  [3MB] English

User Guides

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If you can not download, log into your myHioki account to access more technical documents and information where available.

Precautions Concerning Use of Equipment that Emits Radio Waves Japanese
Instruction Manual German
Instruction Manual French
Instruction Manual Japanese
Instruction Manual Korean

Outline Drawings

If you can not download, log into your myHioki account to access more technical documents and information where available.


Technical Notes

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Declaration of Conformity



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This cart with caster wheels can be easily moved between measurement locations.


Use when positioning the FT3424 sensor unit and display unit separately during use.


φ 3.5 mm (0.14 in) dia. mini plug to banana, 1.5 m (4.92 ft) length


Connect to BNC terminal, 1.5 m (4.92 ft) length


Connect to terminal block, 1.5 m (4.92 ft) length

Carrying cases

C0202: For storing the instrument with the CONNECTION CABLE, OUTPUT CORD, and USB Cable

C0201: For storing the instrument with OUTPUT CORD and USB Cable



PC peripherals

For the FT3425 only


• Mobile app for iOS, Android • Improve efficiency of operations that repeat measurement and recording • Analyze correlated data during issues and generate quick reports

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