50pcs J304 J305 m4011 Geiger Muller tube counter Hard Beta GM Detectors Geiger Counter Kittube for Nuclear Radiation Detector

50pcs J304 J305 m4011 Geiger Muller tube counter Hard Beta GM Detectors Geiger Counter Kittube for Nuclear Radiation Detector
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sku: 4001352947113
$608.60
Shipping from: China
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