Tool Testing Lab is an ISO/IEC 17025:2017 accredited lab. We provide fast (5 days or less) turnaround times for calibration of precision instruments, industrial hand tools, and aviation M&TE. Calibrations are performed in our climate-controlled lab. We also offer onsite fast calibration services for customers within 200 miles of Dayton, OH. Visit our Mobile/Onsite page for more info regarding our onsite calibration service. Check out our new products for sale by clicking here. Certification is included with all new and used tool orders. At Tool Testing Lab our primary goal is to deliver the best customer service possible. During business hours, your phone call will always be answered by an actual person, not a machine. You will be helped promptly and are welcome to speak directly with a friendly and knowledgeable calibration technician. Our techs can help you determine what you need and how we can best serve you. If you have additional needs or concerns you are always welcome to speak with a manager or even the President of our company. Our calibrations come with long-form, NIST traceable certificates. We provide data for every measurement point, including uncertainties. For most calibrations we can provide ISO 17025 accredited certificates at no additional charge.