Salter Brecknell electronic general purpose bench scale with LCD display. Discrete switch keyboard technology - unique key button design to ensure reliability and longevity. Electro-mechanical design - ensures greater accuracy even at higher weight capacities. Construction - 22 gauge steel with ribbed base designed to protect against damage to the scale. Display - four large 1" h digits, back light LCD display. Keyboard functions - hold: freezes weight on the display only when a weight of 3 lbs or more is placed on the scale. Tare: removes weight of empty container or item placed on the scale to obtain a net weight. Units: scrolls between pounds and kilograms. Turns scale on or off and returns scale to zero weight. Indicator displayed messages - L0: battery is weak after 5 minutes scale will turn of. Auto zero tracking - includes AZT (auto zero tracking) at 0.5 or manual push button to reestablish zero reference when displayed weight is less than 2 percent of capacity. Overload capacity - capable of withstanding 400 lbs or 200 kg of weight without damaging the scaLe. Auto shutdown - to conserve battery life the display will shutdown after 2 minutes of non-use. Can be configured via the keypad for off, 2 or 4 minutes. Accuracy: +/- 3 displayed divisions. Scale measures 10-121/128" length by 12-1/2" width by 2-25/128" height. Power - internal battery: one 9 volt (not included) AC adapter: 9 VDC at 200 mA (included). Operating temp - 42 degree F to 104 degree F (5 degree C to 40 degree C). Agency approvals - UL/CUL power adapter; FCC. Capacity: 250 x 0.5 lbs.