Product Accurate Multiple Units G, Oz, Ozt, Dwt, Gn And Ct. Capacity: 50G / 1.7637Oz / 1.6075Ozt / 32.15Dwt / 771.62Gn / 250Ct Readability: 0.001G / 0.001Oz / 0.001Ozt / 0.001Dwt / 0.02Gn / 0.005Ct Precise Operation Provides Precise Results To Ensure Your Creation Is Exquisitely Perfect. How To Calibrate: Turn The Balance By Pressing The On/Off Key. Wait Until The Display Shows 0.000G, Press And Hold The Mode Key Until The Screen Displays Cal, Then Release. Press The Mode Key Again, The Display Will Flash Cal Followed By The Weight Of Calibration Required. Place The Required Calibration Weight In The Center Of The Platform, The Display Will Show Pass, Then Return To Normal Weighing Mode. Calibration Is Complete Repeat The Above Steps If Something Goes Wrong. 6 Types Of Units Precision And Capability Very High Precision Useful Function Measure Diamond, Jewelry,Pearl,Coins, Gold,Silver,Lab,Carat, Coffee Beans, Pill, Powder You Will Get 1 X Digital Powder Scale 1 X Tweezers 1 X Tray Scale 1 X 50 Gram Calibration Weight 1 X User Guide