Product description: This machine is a test instrument for measuring the concentration of pencil lead. Namely the determination of lead core in the specified samples paper scrawling traces’ reflection optical density (symbol d denotes a reflective optical density: d = Lg1 / R450, R450 is a sample for the wavelength of 450nm blue light diffuse brightness factor, that is, under certain lighting conditions, in a given direction, the ratio of sample reflective brightness and ideal diffuse brightness in the same conditions.

Technical date:
1, eliminating specular reflection: Luminance factor error is less than 0.1%, no effect on the concentration measurement;
2, measuring range: 0≤d≤2;
3, the sample size: the length 25mm square;
4, measuring: diameter 22mm round;
5, Repeatability: luminance factor error is less than 0.1%;
6, showing error: luminance factor error is less than 0.3%;
7, Power: 220V ± 10%, 50Hz;
8, the working environment: temperature 10 ~ 30 ℃, relative humidity ≤85%;
9, dimensions (length × width × height); mm: 365 × 245 × 430;
10, instrument quality: about 11kg.

Attachments:
①, A Chinese instrument manual.
②, An instrument warranty card.
③, CNAS international third-party tester calibration report.