Ludlum Model 2220 Portable Scaler/Ratemeter

The Ludlum Model 2220 Portable Scaler/Ratemeter is a self contained counting instrument designed for operation with scintillation, proportional, or GM Detectors.  The unit has a voltage-sensitive preamplifier, linear amplifier, electronic timer and detector HV power supply.  It is a single channel analyzer for use in gamma spectrum analysis.  The analyzer can be switched off to allow for measuring a wide spectrum.  Threshold, window, and HV controls are available.  It has analog and digital displays.

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This unit is similar to the Model 2221 and provides a less expensive alternative to that meter ($750 vs $1250).