LI-COR LI-250A Light Meter
The LI-COR LI-250A handheld light meter displays the output from any LI-CO light sensor with a BNC connector.
Features
- Instantaneous sensor output or 15-second averages can be shown on the display
- Calibration multipliers can be quickly entered & modified
- Low power consumption gives you more than 150 hours of continuous operation
- Free ground shipping
- Expedited repair and warranty service
- Lifetime technical support
- More
Overview
The LI-COR LI-250A Light Meter is designed for applications demanding performance, reliability and ruggedness. It provides a direct digital readout of LI-COR BNC sensors. The LI-250A's low power consumption gives more than 150 hours of continuous operation from a single 9-volt transistor battery.
Adjustable
Measurement units for any LI-COR BNC sensor (μmol, lux, klux, or W m-2) are also displayed. Calibration multipliers can be entered by simply pressing the CAL key, setting the display units (UNITS key), then changing the sensor calibration multiplier with the up and down arrow keys.
In The News
University of Minnesota’s Cedar Creek Ecosystem Science Reserve: Making Significant Contributions to Ecosystem Studies and Environmental Monitoring since the 1940s
Cedar Creek Ecosystem Science Reserve is home to several very important research efforts that have made it into the history books. Cedar Creek was once the stomping ground of Raymond Lindeman, also known as “The Grandfather of Ecosystem Ecology.” Cedar Creek was also the first place where automated telemetry of animals’ movements was utilized. It’s also home to the world’s longest biodiversity experiment, the longest-running elevated CO2 experiment, one of the longest fertilization studies and one of the longest-running burn studies to maintain an oak savanna. Cedar Creek is also the global headquarters of the Nutrient Network.
Read MoreLI-COR PAR sensors detect light waves to aid aquatic ecosystem research
Understanding how the sun’s rays fuel phytoplankton or plant growth may prove valuable to understanding an aquatic ecosystem. 
 A pair of sensors from LI-COR can help researchers studying algal blooms and aquatic vegetation by measuring how much light enters underwater environments. 
 Sitting below the surface, the LI-192 flat-lensed photosynthetically active radiation sensor and the LI-193 spherical PAR sensor measure light waves striking their silicon photovoltaic detectors. They sense light wavelengths between 400 and 700 nanometers, which is the ideal range for photosynthesis. 
 Dave Johnson, a LI-COR product manager for the LI-190 series, said the sensors’ individual designs make them ideal for different applications.
Read MoreOhio State greenhouse nurtures 'fruit fly of the plant world'
The Arabidopsis Biological Resource Center at Ohio State University was established in 1991 with funding from the National Science Foundation. Part of the center’s job is to meet demand for seed of the arabidopsis plant, which is widely used for genetic modeling. 
 
“A lot of the plants we’re growing are for seed production,” said Joan Leonard, greenhouse coordinator. “Arabidopsis is a good example. We call it the ‘fruit fly of the plant world,’ and it takes about six to eight weeks to go from seed to plant.” 
 
Arabidopsis is one of the many plants that will benefit from a new LI-COR PAR sensor being installed on campus. It will help manage light schedules for greenhouse plants.
Read More