EXTECH HD 450( LIGHT METER, DATALOGGING)

Automatically stores up to 16, 000 readings or manually store/ recall up to 99 readings
Large backlit LCD display with 40-segment bar graph
Wide range to 40, 000Fc or 400, 000 Lux
Cosine and color corrected measurements
Utilizes precision silicon photo diode and spectral response filter
Peak mode ( 10mS) captures highest reading
Relative mode indicates change in light levels
Min/ Max and Data Hold
Backlight for readings in low light levels
Heavy Duty rugged double molded housing
Built-in USB port