Check the listing for details. LM399 4-CH Voltage Reference Source 10V/7.5V/5V/2.5V For Voltmeter CalibrationyB. Condition: New. Listed at 23.49 USD. Product Description Specification: Type: Voltage Reference Input Voltage: +15V Output Voltage: +10V/+7.5V/+5V/+2.5V Accuracy: 0.0001(AD584), 0.00001(LM399) Warm Floating: 0.5ppm/℃(LM399)， Optinal Style/Module: LM399, Size: 5 x 5cm(1.97 x 1.97in) Quantity: 1 Pc Factory calibration: 6 semi-digital multimeter FLUKE8846A calibration, the measured voltage standard live in the shield on the shell Payment PayPal is the only payment method we accept.Please confirm your shipping address is correct before you finish the payment. Shipping 1. Item will be shipped within 1-5 business days from CN Stock or US Stock according to the item location. 2. Sometimes the ship date will be delayed due to a shortage. We will inform you via message. 3. Please leave available address and phone # in delivery information. Seller are not responsible for wrong address. 4. Please indicate your personal requirement such as colors, packages, value of declaration etc. at PayPals message when make payment. 5. We will NOT responsible for any delay during delivery including but not limited to customs postage checking, strike, force measure etc. Notes, the delivery time may vary due to public holidays, natural disasters, customs issue and other unexpected impact, etc. Policy 1. Return item must be unused and in the same condition you received it, in original packaging.2. Once the return is authorized, it is buyers responsibility to return the product and package securely to prevent any damage during transit.3. If you are not satisfied when you receive your item, Please contact me before you return it.Then return it within 30 days for a replacement or money back. The postage and packaging fee will not be refunded. Feedback Please leave us a Posive Feedback if there is nothing wrong with the item, we will appreciate it and do the same for you. Contact US Please contact us via ebay message. all questions will be replied within 24 working hours.Customer Support Online: 9am-18pm (GMT +8) Monday - Friday