The SRV315 permits veterinarian and zoological specialists to weight birds up to 3,000 grams or 6 pounds. The large base along with its 5 inch perch, permits the bird to be comfortably placed for proper weighing. The bottom of the base also has a bracket that attaches the scale to a table or countertop. The perch attaches to the bottom of the base so the bird will not be able to move the perch around. The SRV315 can also function as a gram scale. Simply remove the perch for weighing smaller animals. This scale may also be used as a daily nutrition scale. 3000 grams x 1 gram resolution Dispaly units - Grams or Ounces 5 Inch Perch - allows tail to be elevated off the ground Battery Operated - Two (2) CR2032 Lithium Batteries Auto Power Down (APD) approximately 120 seconds Hold - Freezes the weight on the display