The optical path design is reasonable, simple. Adopt filter with correction, the whiteness can be reflected quantitatively, measurement range: 0-120. Built-in high-precision sensors, combined with advanced optical devices, effectively improve measurement accuracy and stability. Digital display design ensures clear and accurate readings, and each measurement result can be accurately presented without reading errors. Standard RS232 interface and printing function, can be connected to printers and computers for output. Convenient for data analysis and processing. Split design provides greater operational flexibility and is suitable for various complex measurement environments. Measuring range: 0-120 Resolution: 0.1 Light source: LED 457 nm light source Whiteness formula: blue light whiteness =R457 Measurement aperture: 15mm Zero drift: 0.1 Indication stability: 0.5 Measurement repeatability: 1 Colour:As Shown Material:Plastic+Metal Package Contents: 1 x Whiteness Meter Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.