Monitor 4 Survey Meter


Monitor 4 Survey Meter


The Monitor 4 Survey Meter is lightweight, ergonomically designed and includes its own carrying case. Used to measure alpha, beta, gamma and x-ray radiation, it provides extremely accurate results with both audible and visual indication. The easy-to-read scale features three ranges for maximum sensitivity and runs up to 2,000 hours on a 9V battery.

Pocket-sized monitor with meter, LED count light, and beeper

  • Monitors alpha, beta, gamma, and x-ray radiation
  • Dual-scale analog meter (CPM and mR/hr)
  • Operating range: 0-50 mR/hr, 0-50,000 cpm
  • Multiplier selections: x1, x10, x100
  • Red LED flashes with counts
  • Audible beep indicates rising radiation level
  • Operates up to 2,000 hours on 9V battery
  • Weighs less than 9 ounces (including battery)
  • Detector: Halogen-quenched uncompensated GM tube with thin mica window 1.5-2.0 mg/cm2 thick
  • Energy Sensitivity: Detects alpha down to 2.5 MeV; typical detection efficiency at 3.6 MeV is greater than 80%
    - Detects beta at 50 keV with typical 35% efficiency
    - Detects beta at 150 keV with typical 75% efficiency
    - Detects gamma and x-rays down to 10 keV typical through the end window,
    40 keV minimum through the case
  • Accuracy: ±15% of full scale (referenced to Cs-137)
  • Visual Indicators: .875" x 1.75" (2 x 4 cm) dual scale analog meter, marked 0-500 cpm and 0-0.5 mR/hr; LED count light
  • Audio Indicator: Internally mounted beeper (can be switched off for silent operation)
  • Range Switch: x1, x10, x100, battery check
  • Ranges: 0-500, 0-5,000, 0-50,000 cpm and 0-0.5, 0-5, 0-50 mR/hr
  • Current Drain: Typically 190µA at background radiation levels
  • Operating Voltage Range: 7-11 Volts DC
  • Voltage Regulation: High and low voltage fully regulated
  • Power Requirement: One 9-volt alkaline battery, NEDA #1604A, or equivalent
  • Battery Life: Up to 2,000 hours at normal background radiation levels
  • Temperature Range: -4°F to +131°F (-20°C to 55°C)
  • Dimensions: 8.25" x 2.75" x 1.87" (210 x 70 x 48 cm)
  • Weight: 9.7 oz (.28 kg) including battery, 7.2 oz (.21 kg) without battery

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