Power on on (ON / OFF): Press it to turn on in the shutdown state, and turn off in the off state.<br/>Tare key (TARE): When weighing, press once to display -0- and then return to zero. In order to force a zero reset, this function is required to remove the tare of the cover when weighing with the protective cover.<br/>Calibration key (CAL): lightly press the key once to display CAL and display the flashing weight value (such as 500.00) after one second. At this time, load 500g weight on the weighing pan and display PASS after 4 seconds, then display a stable 500.00, (If there is no 500g weight, please press UNIT or TARE key to select the matching weight value, the minimum must not be less than 100g,) Calibration is completed.<br/>In weighing state, press and hold the (quantitative) key for 3 seconds without letting go. The LCD icons A-1, A-2, A-3, A-4 and flash together. Press the unit key or TARE key to select (A-1), then Press the (quantitative) key to confirm;<br/>at the same time, the last digit 0 of the 000000 in the weighing area flashes, press the unit key to select 0-9, press the TARE key to select 9-0, press the quantitative key to shift the second digit, and the decimal point The position is determined according to the established specifications and cannot be moved. Set higher than (X) weight value alarm.<br/>1.2. LCD display size: 55X21.5MM<br/>1.3. Weighing pan size: diameter 112MM 1.4. Power supply: 3XAAA & USB (random delivery)<br/>1.5. Function keys:<br/>UNIT (unit). TARE (tare). CAL (calibration). PCS (count key). F-W (fixed number alarm). Switching machine (ON / OFF)<br/>1.6. Backlit display: white (orange) 1.7. Free choice of shutdown time<br/>1.8. Operating temperature: 10-30 Celsius (Perfect state) 1.9. Unit can be turned off and on at will.<br/>1.10. Fixed number and quantitative alarm function (upper and lower limit setting) 1.11. One-key calibration function<br/>1.12. 7 unit selection: g, oz, ozt, , tl, ct, gn 1.13. TARE forced zero tare function<br/>1.14. Specification selection: 1000g / 0.01g<br/>two. Product appearance and instructions<br/>This product series is -A, -B, -C, (as shown ) represents A type = on form, B type = waterproof and dustproof PC panel on form, C type = carat scale with windshield mode<br/>After connecting the power, please place the product on a stable and windless table, press the power on, the LCD displays 88888 and returns to zero. You can weigh now<br/>three. Key function description<br/>Colour: silver + black<br/>Material: stainless steel<br/>Size: 204.5X131.5X39.5MM<br/>Package Contents:<br/>1 * 100g weight<br/>1 * USB cable<br/>1 * electronic scale<br/>Only the above package content, other products are not included.<br/>Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.