Thank you for viewing. This is an analog cooking scale made by TANITA. You can place a container on the scale and turn the blue knob to subtract the weight of the container and measure the contents. (Image 3) Also, you can adjust the zero point with the knob on the back (Image 4). - Brand: TANITA - Color: Yellow - Type: Analog scale - Maximum weight: 1000g (1kg) - Minimum graduation: 5g Contents of the sale: Scale body only (No batteries required as it is analog) If you have any questions, please feel free to ask.