Ludlum Model 9 Ion Chamber 0-5R/hr range direct measurement of radiation fields The Ludlum Model 9 is a specific model of a handheld radiation survey meter manufactured by Ludlum Measurements, Inc. The Ludlum Model 9 is designed for general-purpose radiation detection and measurement applications. The Ludlum Model 9 is a portable and compact radiation survey meter. It typically features a built-in Geiger-Mueller (GM) detector for detecting and measuring gamma radiation. The meter provides users with real-time radiation readings in counts per minute (CPM) or counts per second (CPS) units. It has an analog display to show the radiation levels. The Ludlum Model 9 may have various operational modes, including rate, integrated dose, and alarm settings. The meter is powered by replaceable batteries, such as alkaline or rechargeable batteries. (Batteries are not included) Please be aware that this unit powers on, but it has not undergone professional testing. Therefore, it is being sold as is, without any guarantees or warranties. Please note that calibration or recalibration may be required to ensure optimal accuracy based on your specific application and requirements. It may show signs of normal wear and tear, such as minor scratches or scuffs, but it does not affect its performance. Please refer to the provided photos to get a better idea of the condition of the flow meter.