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These differ from the standard Model 2221 because they have the top face mounted RS-232 adapter option from Ludlum
For hazmat teams investigating potentially explosive atmospheres
Single RotometerMultiple Reinforcement for the Electrical Cord
mR/hr and R/hr range selection
Eberline HP-100B Gas Proportional Alpha Beta Probe GM Geiger Counter Radiation Alpha Beta Dual These differ from the standardThe HP 100B is equivalent to the Ludlum 43 143, 100 cm Gas Flow Proportional Detector which is used for alpha beta contamination measurements wherever a steady supply of P10 counting gas is available. It has an MHV connect. The gas is supplied up through the detector signal cable so no additional gas feed lines are needed making its use just like any other external probe. Another nice feature of this design is the removable faceplate which simply