The instrument is verified according to the measurement regulations of JJG595-89 Colorimeter and Colorimeter.

①Main unit ②LCD display ③Operation keyboard ④Optical test head ⑤Reflective sample test bench

⑥Power switch ⑦Power cord socket ⑧Fuse ⑨Printer ⑩Connecting cable

1. Edit key part: It consists of six keys, whose function is to modify various parameters set by the user and input new parameters. See Figure 4.
(1) ← key: the cursor moves to the left, used to move the digit to be modified when editing data.
(2) → key: the cursor moves to the right, used to move the digit to be modified when editing data.
(3) + Increase key: Add one to the modified value.
(4) - Decrease key: Decrease the modified value by one.
(5) Next page turning key: display the content of the next screen (page).
(6) Edit key: enter into the edit or exit the edit part.

2. Operation key part: It is composed of seven keys, and its function is to operate the instrument for zero adjustment, white adjustment, measurement, display, and printout of measurement results. See Figure 5.
(1) Zero adjustment Zero adjustment key: Press this key to enter the state of ready zero adjustment.
(2) Standard whitening key: Press this key to enter the state of preparing for standard calibration (whitening).
(3) Sample test key: press this key, the instrument enters the state of preparing to measure samples.
(4) Display key: after sample measurement, press this key to display the measurement result. Press this key continuously to display all the required measurement results.
(5) Print Print key: after sample measurement, press this key to print out the measurement results.
(6) Reset reset button: Press this button to confirm that the sample to be measured is the reference sample for comparing color difference. When the instrument is preheating, it can interrupt the preheating and enter the working state.
(7) Execution key: Press this key in the preparation state of zero adjustment, standard calibration (white adjustment), sample measurement, etc. to perform various operations.