1. Small size and easy to carry. Due to the use of energy-saving and energy-saving devices, it can work continuously for nearly 8 hours with only four AA batteries, and it can be used to monitor the Ringelmann  blackness.

2. Large LCD screen with interactive menu display, make the operation simple and easy to understand, no need to remember commands.

3. There is an electronic memory, which can store 84 sets of data, each set of data includes six data such as test month, day, hour, minute, second, Ringelmann  blackness.

4. With print function, it can get the print result of Ringelmann  blackness on the spot.

1. Telescope viewing angle magnification 10 times

2. Telescope observation distance 10 ～ 500 meters

3. Clear aperture of objective lens 50 mm

4. Electronic Ringelmann  blackness level 0 ～ 5 levels

5. Measurement accuracy 0.2 level

6. Ni-MH battery / power DC9V.300mA

7. Sampling time: 30 minutes method, continuous, 1, 5, and 10 minutes are optional

8. Weight: 1.2kg

9. Volume: 330 × 120 × 110 (mm)