Extech HD400 Heavy Duty Light MeterExtech HD400 Heavy Duty Light Meters Heavy Duty Light Meters Datalogging Model Available Automatically stores up to 16,000 readings or manually store recall up to 99 readings. Key Features: HD450 Datalogger model automatically stores up to 16,000 readings or manually store recall up to 99 readings 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