Ludlum- Model 2402 Pocket-Size Survey Meter with Alarm

The Model 2402 is a pocket sized survey meter designed to quickly
and easily measure ionizing radiation. It may be used with almost
any external Geiger-Muller (GM) or scintillation detector. The
instrument features user-adjustable calibration and alarm set
point controls located under a protective cover on the front panel.
This instrument is rated for indoor or outdoor use within a
temperature range of -20 to 50 °C (-4 to 122 °F). It may be certified
for operation from -40 to 65 °C (-40 to 150 °F). Maxmimum relative
humidity is 95% (non-condensing).