The Model 206 dosimetry electrometer maintains the simplicity of classic electrometer styling while utilizing contemporary design and state-of-the-art electronics. The Model 206 is simple to operate. All controls are located on the front panel. The nomenclature is clear and concise. The value is displayed in easy-to-read 0.7-inch digits. A tilt bail is provided for optional viewing angles. The Model 206 has a broad range of operation and can accommodate any size of ion chamber. The versatility of the Model 206 stems from its innovative modular design. The amplifier feedback element is contained in an external module. This module is removable and can be exchanged with any number of modules. Each module changes the measurement features of the electrometer. In this way, a single electrometer can be configured to satisfy a wide range of applications. By pairing an ion chamber with a specific module, full calibration of all chambers on a single electrometer can be achieved.