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Package Contents 1x digital scale and with wind shield 1x gem scoop 2x 20 g calibration weight 1x user manual Specifications Capacity: max 50 g Weight to Start: min 0.005±0.001 g (5±1 mg) Readability / Graduation: 0.001 g (1 mg) Divisions: 50,000 Weighing Units: gram, ounce, troy ounce, pennyweight, carat, grain, tael Display: Backlit LCD Operation Environment: 5-35 °C (41-95 °F) indoor Materials: ABS, stainless steel Scale Dimensions: 140x89x64 mm (5.5x3.5x2.5 in) Scale Weight: 226 g (0.5 lb) Weighing Pan Diameter: 60 mm (2.3 in) Power Source: 4x 1.5V AAA battery Warranty This scale is guaranteed for one year. The limited warranty covers defective factory parts under normal operating conditions. Maintenance Protect the scale from shock, overload, liquid spills, extreme temperatures, moisture, UV, and other abuses. Empty the weighing platform after each use. Preserve the finish of the scale by wiping only with damp, soft cloth and non-abrasive mild detergent. If the scale will not be used for a long period of time, remove the batteries and disconnect the power adapter. OIML Calibration Weights Information Class E1 – The highest accuracy intended for calibrating E2 weights and lower. Class E2 – Intended for calibrating F1 weights and lower. Suitable for calibrating high precision analytical balances with a readability from 0.1mg to 0.01mg. Class F1 – Intended for calibrating F2 weights and lower. Suitable for calibrating high precision top loading balances with a readability from 10mg to 1mg. Class F2 – Intended for calibrating M1 weights and lower. Suitable for calibrating moderate precision analytical balances and use in high value commercial transactions such as precious metals and stones. Class M1, M2, M3 - Economical weights for normal laboratory, industrial, business, technical and educational general use.