Main features: 
 ● Small size, easy to carry, the use of energy saving devices, with only four on the 5th battery can work continuously for nearly 8 hours 
 Ringelmann blackness can be hand-held monitor. 
 ● Large LCD screen interactive menu display, all Chinese, so simple and easy to understand, do not need to remember commands. 
 ● There are electronic storage, can store 84 sets of data, each data including test month, day, hour, minute, second, Lingeman blackness six data. 
 ● The print function can be Ringelmann blackness in the field of print results. 
 Main Specifications: 
 1. Telescopes 10 times magnification view 
 2. Telescopes from 10 to 500 meters 
 3. 50 mm objective lens aperture 
 4. Ringelmann black grade 0 to 5 
 6. Ni-MH battery / power DC9V.300mA 
 7. Sampling time: continuous, 1,5,10 points were measured Optional 
 8. Weight: 1.2kg 
 9. Sizes: 330 × 120 × 110 (mm)