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Light Meter

LI-250A Light Meter

Professional Portable Light Measurement

The LI-250A is a versatile, handheld meter designed to display high-precision output from any LI-COR light sensor equipped with a BNC connector.

Whether you need instantaneous readings or 15-second averages, the LI-250A provides the flexibility required for both field and laboratory research.

Key Capabilities:

  • Auto-Range: Automatically selects the best sensitivity range for maximum accuracy.
  • High Resolution: Wide dynamic range allows for precise measurements even in extreme low-light conditions.
  • Universal Compatibility: Works seamlessly with all LI-COR BNC-terminated sensors.
Reliable measurement solutions for environmental research.
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Technical Features

One-Touch Averaging
Toggle 15-second averaging on or off instantly with a single button press.
Extended Battery Life
Get over 150 hours of continuous operation from a single 9-volt battery.
Auto Shut-Off
Conserves energy by automatically powering down after 20 minutes of inactivity.
Weather Protection
O-ring sealed case provides durability and protection for field measurements.
Simple Calibration
Easy-to-enter multipliers allow for fast sensor swapping without hassle.

Supported Sensors:

LI-190RLI-191RLI-192LI-193 LI-200RLI-210R

Specifications

Technical Specifications

Accuracy 25 °C: ± 0.4% of reading ± 3 counts
0 – 55 °C: ± 0.6% of reading ± 3 counts
Range Selection Autoranging (3 ranges)
Linearity ± 0.05%
Sensor Compatibility Designed for “SA” sensors; “SB” and “SL” compatible (with BNC).
Memory Stores calibration multipliers for 2 sensors via keypad.
Display & Update LCD display; updates every 0.5 seconds.
Power One 9V Alkaline battery (~150 hours life).
Operating Environment 0 to 55 °C, 0 to 95% RH (non-condensing).
Dimensions & Weight 14 × 7.7 × 3.8 cm; 0.26 kg (0.57 lbs).

LI-250A Range and Resolution

Sensor Type Measurement Range Resolution
Quantum 0-199 / 0-1999 / 0-19999 µmol s⁻¹ m⁻² 0.01 / 0.1 / 1 µmol s⁻¹ m⁻²
Pyranometer 0-19 / 0-199 / 0-1999 W m⁻² 0.001 / 0.01 / 0.1 W m⁻²
Photometric 0-1999 lux / 0-19999 lux / 0-199 klux 0.1 lux / 1 lux / 0.01 klux

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