The Model 52 Series Portable Portal Monitors (52-1, 52-5, 52-6) are compact, FEMA-REP-21 compliant instruments for beta-gamma contamination monitoring. Designed for quick setup in under five minutes without tools, they feature microprocessor-based electronics, automatic background updates, and dynamic alarm settings for reliable operation.

The monitors can function in walk-through or stop-and-count modes, offering flexible sensitivity options. Each unit includes a wheeled transport case and weather sleeve, and can operate on AC power, vehicle adapter, or “D” cell batteries for field versatility.