Check the listing for details. NOS Never Used Altek Model 941 Frequency Calibrator. Condition: New – Open box, Made in United States. Listed at 499.99 USD. The Altek Model 941 Frequency Calibrator is a high-quality tool designed for precision measurement and calibration in various industrial and business settings. Made in the United States by Altek, a trusted brand in the field, this calibrator has never been used, ensuring its reliability and accuracy. With its straightforward design and reliable performance, this calibrator is ideal for professionals looking to maintain the quality and consistency of their measurements. This is new old stock item that has never been used. Check over the pics and see for yourself. No box, or paperwork included. Please ask any and all questions prior to purchase. Winner to receive free shipping of my choice via USPS, UPS, or FedEx to lower 48 only no PO boxes.