Extech LT250W Bluetooth Lux Meter with Data Logging

Measuring light intensity accurately is critical in workplace safety audits, photography, horticulture, and HVAC commissioning. The Extech LT250W lux meter delivers precise illuminance readings up to 400,000 lux (40,000 foot-candles) with a remote sensor on a coiled cable, so you can take measurements in awkward spots without shading the sensor. Its Bluetooth 4.0 connectivity pairs with the free ExView app for data logging, trend analysis, and report generation on your iOS or Android device.

Who is it for

Facility managers, electricians, lighting designers, and safety inspectors who need to verify light levels against OSHA, EN 12464, or other standards. The wireless data logging makes it easy to document compliance and share reports.

Main features

• Wide measurement range: 0 to 400,000 lux (0 to 40,000 FC) with auto-ranging
• Accuracy: ±3% rdg ±0.5% FS, calibrated to a 2856°K incandescent lamp
• Bluetooth 4.0 (BLE) with ExView app for remote monitoring and data logging
• Stores up to 30,000 readings in the app
• 4000-count backlit LCD with analog bar graph
• Data Hold, Min/Max/Avg, Relative mode, and Zero adjustment
• Remote light sensor with spectral response filter (CIE photopic)
• Auto power off to conserve battery

Specifications

• Measurement range: 0 to 400,000 lux / 0 to 40,000 FC
• Resolution: 0.1 lux (up to 999.9), 1 lux (up to 9999), 10 lux (up to 99999), 100 lux (up to 400000)
• Accuracy: ±3% rdg ±0.5% FS
• Sensor: silicon photodiode with spectral response filter, CIE photopic
• Bluetooth: version 4.0 (BLE)
• Data logging: up to 30,000 readings via ExView app
• Sampling rate: 0.5 seconds
• Display: 4000 count LCD with backlight
• Power: 3 x 1.5V AAA batteries (battery life approx. 100 hours without backlight/Bluetooth)
• Operating conditions: 0 to 50°C (32 to 122°F), 0 to 80% RH non-condensing
• Included accessories: remote light sensor, protective cap, 3 AAA batteries, carrying case

Tips

For best accuracy, allow the meter to warm up for a few minutes before taking readings. Use the Relative mode to subtract ambient light when measuring a single source. The ExView app lets you set sampling intervals and export data as CSV for further analysis.