Applications:
It measures the total amount of Visual Light Transmission (henceforth referred to as VLT) through a window and any coatings (tint film) on that window.
Specifications:
Disply:      10mm LCD
Accuracy:      0.1
Wavelength: 550 Nanometers
Measurement Range: 0 to 100% Light Transmission
Interface:   RS232C
Sample Thickness:   Less than 10 mm/0.4inch
Sample Size:   50 x 50 mm Minimum
Time of Testing:   Maximum of 4 Seconds
Effects From Stray Light:   Not Effected by Stray Light
Lamp Life:   10 Years
Operating conditions:   0-50℃,<90%RH
Power Source:   4 x 1.5v AAA Batteries
Weight:    100g (not including batteries)
Dimensions:   126 x 65 x 27 mm(5.0 x 2.6 x 1.1 inch)
Standard accessories  included :
   Carrying case   1 pc.
   Operation manual      1 pc.
Optional accessory:  Cable and software  for RS232C