Both of these can be used as a replacement for the standard 4-series electrochemical Sulfur Dioxide (SO₂) sensors.

• 4SO2-20B - No sensitivity loss over time due to humidity
• 4SO2-20BF - No cross-sensitivity to H2S and No sensitivity loss over time due to humidity

EOC and SemeaTech offer gas sensor products featuring minimized environmental impact, no application errors, higher resolutions, increased sensitivity, improved stability, better exchangeability, wider measuring ranges, etc.

Their Gamma Sensor Module consists of a cesium iodide crystal, a photodiode, and a high-gain preamplifier that can be used to measure X and γ radiation from 50keV to 3MeV. It features high sensitivity and a fast response time (of about a second) to a very minor change of X and γ ( 0.01 μSv/h ).

The SemeaAlert-Gamma is a Personal Alarm for exposure to ionizing radiation hazards.  It is designed to alert those who are concerned about accidental exposure to ionizing radiation hazards in the environment. This product features high sensitivity and a quick response time ( of about a second ) to a very minor change of X and γ ( 0.01 μSv/h ). Unlike other professional X and γ detectors, SemeaAlert -Gamma is not built with a digital display. Instead it has a large LED and buzzer that change the color and number of beeps to indicate Normal, Low-Alarm, Mid-Alarm and High-Alarm representing radiation levels. This design helps the users who lack knowledge of radiation easily understand how strong the radiation is. It is a lower cost system and is an affordable personal radiological protection device.