What are your business hours or customer service hours? 30 January 2023 19:36 Updated Customer Service Hours Open from 8 a.m to 4 p.m.* Monday to Friday*ET (Eastern Standard Time) Related articles When Will my Tero be Delivered? How Can I Return My Tero Device? I’ve Lost My Reference Code. Where Can I Find It? Consult the complete User Guide How Will My Tero Device Be Delivered?