The 1210N is perfect for accurately weighing diamonds and precious gems, with 4 weighing modes – carat, gram, troy ounce, and grain. Incorporating a draft-eliminating shield to remove even the slightest influence from drafts or air currents it provides highly accurate readings on its easy-to-read 5 digit LCD. Features include tare and calibration functions, stability indicator, energy saving auto power-off, and a low battery indicator. Includes an AC adapter, you can operate the scale without battery power. Also includes soft case, gem cup, and 20g calibration test weight. A professional accuracy level of 0.01 carat is achieved for a total capacity of 100 carats, and the 1210N does not to be calibrated each time the scale is shut off. Tare weight function Unit Weight 9.7 oz Capacity Grams (g) 20 Carat (ct) 100 Grain (gr) 308 Troy Ounce (ozt) 0.64 Increment Grams (g) 0.002 Carat (ct) 0.01 Grain (gr) 0.05 Troy Ounce (ozt) 0.001