The Tree LC-VS 330 veterinary scale has a 33.1" x 16" platform that is great for weighing smaller and mid sized animals or for general weighing. The glass platform allows for easy cleanup. For continuous use the Tree LC-VS 330 can be powered by the included AC power adapter or for portable applications use 4 AA batteries (not included). The 4 button keypad keeps operation of the scale simple. The HOLD function allows the operator to freeze the weight on the display until the HOLD button is pressed again. This gives the operator time to record the weight after the animal or product is removed from the scale. The Zero/Tare key will allow the user to zero/tare up to 100% of the scale capacity.