Hardly been used. Working fine. Battery included. This Solarmeter Model 4.0 Standard UVA Meter is a high-quality device that is perfect for measuring UVA radiation levels. It is a must-have for photographers, scientists, and anyone else who needs accurate UVA measurements. The device is made from durable materials and is designed to last. With its easy-to-use interface and high level of accuracy, this UVA meter is the perfect addition to your toolkit. The Solarmeter Model 4.0 is also incredibly versatile, able to measure UVA radiation levels in a wide range of applications. Whether you're working in the studio, out in the field, or in a laboratory, this device is the perfect tool for the job.