Light Measurement

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LI-250A Light Meter

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Direct Digital Readout

Instantaneous sensor output or 15-second averages can be shown on the LI-250A's display. Measurement units for any LI-COR sensor (µmol, lux, klux, or W m-2) are also displayed. The high quality amplifier in the LI-250A provides excellent long-term stability and automatic zeroing. This high gain amplifier gives very low input impedance to sensors, resulting in excellent linearity. Typical accuracy is 0.4% of reading at 25 °C.

Automatic Range Selection

The LI-250A simplifies operation by automatically selecting the range with the best accuracy and resolution for a given sensor input signal. The wide dynamic range allows measurements in a wide variety of light environments.

Hold Key

Pressing the HOLD key lets you retain the current reading on the display. Pressing the HOLD key again returns the LI-250A to measurement mode where the display is continuously updated.

Average Key

15-second averages can be collected and then held on the display by pressing the AVG key.

Hand-held, Battery Operated

The LI-250A's low power consumption gives you more than 150 hours of operation from a single 9-volt transistor battery. To conserve battery life, the meter auto-matically shuts off after 20 minutes of inactivity.

Weathertight

The LI-250A light meter case is O-ring sealed to make it weathertight.

Sensor Calibration

Calibration multipliers for LI-COR sensors can be entered by simply pressing the CAL key, setting the display units (UNITS key), and then changing the sensor calibration multiplier with the up and down arrow keys. Two sensor multipliers can be held in memory to aid in switching between sensors.


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