Tree HRB 203 Lab Scale: 200g x 0.001g. Also weighs in Carats. Unit has 0.8″ LCD Display w/ Backlight, 200,000 divisions / 1.3m internal Res., Round 3.8 inch Platter, AD update Speed: 7.5HZ, Glass Draft Shield – Outer dimension of draft shield = 7 x 6 x 7 1/2 inches, US Made AD /AC. Can run on 6 AA batteries (NOT included). Measurement Units: g,0z, lb, dwt, ozt, ct. weighs 10 lbs. External Calibration Model comes with Calibration Weight. 2 Year Warranty.