Most instruments used the same detection technology, and except for price, there was not much difference between designs. But that is no longer the case. In the past few years manufacturers have developed new ways to detect combustible gas, new ways to measure oxygen, and many new types of sensors for toxic gas measurement. Monitoring requirements have changed as well. A simple four gas meter may not be sufficient for many CS users. There are also new strategies for wireless communication, and ways to track results and help coordinate the response during emergencies. Whether you are a CS supervisor, attendant, entrant or program administrator, it's easy to make dangerous mistakes if you have not been trained in these product differences. Whatever your role in your company's CS program, this presentation will help you understand the issues. It's increasingly important to take an organized approach when considering or using new products. Choosing an instrument with the wrong sensors or features can make it impossible to use the product safely. This is not only a waste of money, it is a loss of safety. In March 2023 the American Industrial Hygiene Association (AIHA) published a White Paper that proposes a formalized a “standard of care” process for selecting portable real-time direct reading instruments (DRIs) that are fit for purpose, configured properly for detecting the required conditions, and notifying the user through readings and alarms. The process is applicable to all types of real-time detection sensors and systems, including instruments used in confined space entry. This presentation will present and explain the five step process and discuss its application using practical examples. The AIHA has also published a "framework" document that specifies training requirements for real-time instrument users, and specification sheets for defining product features and capabilities when making decisions about which product to specify. Using these tools ensures that the products you specify and use are the right atmospheric monitors for the job. Level: Supervisor (Intermediate Manager (Advanced) Safety Practitioner (Expert) Key Learning Objectives 1) How to specify and define your CS monitoring objectives. 2) How to select the optimal CS instrument and verify it is fit for purpose. 3) How to specify and manage your CS gas detector training requirements.