Specification 1 Type of measurementHard -ray, -ray and x-ray 2 Type of detectorsMetal geiger counters (GM-100A imported from Russia) (GM-100 made by CNNC) 3 Service life of detectors2X1010 times 4 Range of measurementGM-100A: 0.0036000uSv/h GM-100: 0.001000uSv/h) overload range at 1800) 5 Range of peak value0.11000 mR/sec(GM-100A) 6 Range of accumulated doses0-999mSv 7 Measurement accuracy15% +6/p 8 Alarm valueCapable of automatically setting alarm values 9 Alarm modeSound and shock 10 Energy response range GM-100A Gamma : 0.11.25Mev Beta : 0.253.5Mev X-ray: 0.033.0Mev 11 Language selectionChinese and English menu 12 Measurement unituSv/h, mR/huSv 13 Accumulated dose duration1-9999 minutes to be set 14 Accumulated doseAutomatic accumulation and manual clearance 15 Maximum value holdingAutomatically holding the maximum value of the current accumulated doses 16 Curve atlasThe curve map of the latest hour, automatic calculation of maximum values and average values, and automatic tracking of maximum values to display curves 17 Measurement modeRapid and smooth mode 18 Operating environment-3060, 5%-95%RH (no dew) 19 Power supplyOne AA dry batteries 20 WeightOverall unit at 90 grams 21 Dimension74*58*29 mm (excluding protruding portion) Scope of application: 1.Integration of personal dosimeters and radiation monitoring devices 2.Test of the protection against medical radiation 3.Application of the test of nuclear wastes 4.Check of X-ray equipment leakage 5.Transport and protection of neutrons and other radioactive sources 6.Measurement and warning of other radiactive materials 7.Supporting the customization and development of counting tubes Product characteristics: Full metal GM countersaccurate indication, quick response and long service life; Having maximum value holding function, capable of checking curve trends for the latest hour; Sound/shock double alarm, and the user can set alarm values; Switching between Chinese and English language menus; Package includes: 1 set * GM-100/A personal dosimeters 1 pc * USB cords 1 copy * Operation instructions 1 unit * Product packaging box Note: Please understand because of the light irradiation or computer display difference, so I can't guarantee photos and real color is 100%