Accurate, reliable, affordable, lightweight, and easy to use!The Monitor 4 is a handy general purpose survey meter capable of detecting alpha, beta, gamma, and X-rays. Audio can be switched off for silent operation.

Detector: Uncompensated halogen-quenched gm with 1.5-2.0 mg/cm* mica end window.

Energy Sensitivity: Detects Alpha down to 2.5 MeV through the end window; typical efficiency at 3.6 MeV is greater than 80%. Detects 50 KeV Beta at 35% typical efficiency; 150 KeV is typically 75%. Detects Gamma and X-rays down to 10 KeV through the end window, 40 KeV minimum through the case.

Meter Reading: 0-.5 mR/hr and 0-500 CPM, in three ranges, x1, x10 and x 100. Meter Range: 0 - 50 mR/hr and 0 - 50,000 CPM. Power: One 9 volt alkaline battery provides up to 2,000 hours of operation at normal backgrounds levels.Temperature: -20*C to +50*C. RSO carries other Radiation Alert Monitors including;* Monitor 4EC, an energy compensated GM detector, 0 - 50 mR/hr range.* Model MC1K an energy GM detector, 0 - 1000 mR/hr range.All Radiation Alert* models feature:* Internal detectors for ease in handling.* Anti-saturation circuitry.* Red count light.* Audible beeper* Easy-to-read analog or digital display.* Exceptionally long battery life.