Digital Precision Jewelry Scale Pocket 0.001G Milligram Portable Professional with 50g Calibration Weight ?. Operation Place the scale on a horizontal flat surface. 1.Press "ON/OFF" key to turn on the scale. 2.Wait until the LCD display shows "0.0" or "0.00". 3.Put the object(s) on the center of weighing platform. 4.Press "MODE" key to switch between the units. ?.Tare Function 1.Turn on the scale as described above. 2.Place the "tare item" on the platform. 3.Press "TARE" key and wait until the LCD displays "0.0" or "0.00". 4.Add the "net-weight-item". ?.Calibration 1.When the scale is turned off, press ON/OFF key to turn on the scale, wait until "0.0" or "0.00' is displayed. 2.Press and hold the "MODE" key until the display shows "CAL", then release the button.Press "MODE" key again and then the required weight flashes on the display. Place the required weight onto the center of the platform. 3.The LCD display reads "PASS" and come back to the normal weighing mode.Calibration is complete. Repeat this process if something was going wrong. Please check the availability of weights at the store you bought your scale from. ?.Attention 1:Do not operate beside the computer or someplace with high radiation,do not have wind. 2:Remember to take off the battery when you do not use it for a long time,do not store in humid environment 3:Need to be cleaned when the scale body have stains,wiping with dry towel is okay. 4:Pay attention to the waterproof 5:Due to the international logistics,the scales is without battery,you need to prepared yourself. Thanks a lot for your support and understand ?.Package includes 1XDigital scale 1XEnglish manual Shipping 1.If you need to buy in bulk, please contact, we will reply in 24 hours. 2.We are always working hard to ensure your package arrives as soon as possible. Please understand that some factors like weather, high postal traffic, and the performance of shipping companies are outside of our control. 3.Usually product Reaches after about 12-45 business days depending on destination. If you have not received your shipment within 45 days from payment, please contact us. We will track the shipment and get back to you as soon as possible with a reply. Refund or resend product will be offered if item still not received. 4.We maintain high standards of excellence and strive for 100% customer satisfaction! Feedback is very important. We ask you contact us immediately BEFORE you give us neutral or negative feedback, so that we can satisfactorily address your concerns. It is impossible to address issues if we do not know about them! THANK YOU :)