Please find the Calibration steps below along with a Tutorial video.
STEP 1: Switch on the scale.
STEP 2: Immediately press the UNIT button for 4 times(4th time it needs to be pressed for long). The screen will display 5000.
STEP 3: Then press the TARE button, it will show CALO, and 5000 will blink.
STEP 4: Keep a 5kg weight (single stone/single pack) on the scale until the display calculates weight and 'PA55'/'PASS' appears on the screen and again comes to 5000.
STEP 5: Now you can press the TARE button, remove the weight and switch it off.