The #ESP12.OLED - universal ESP8266+0.96"OLED MCU board  is a universal board based on the ESP8266. This board can be used for a variety of tasks. The ESP12.OLED_V1 can also be easily connected to another of our products, the Geiger counter #GGreg20_V3 Ionizing Radiation Detector with a pulse output. 
These two modules allow you to build a basic radiation dosimeter configuration. Read about it in our publication.

Also note that it is possible to add #I2CUI4_V1 - User Interface I2C keypad with 5-keys  a user interface module to these two modules. In this configuration, we get a fully functional set: 

- a controller, 

- a sensor, 

- a display,

- a navigation I2C keypad with an RGB LED, a buzzer and 7 spare GPIOs.

Source:

https://iot-devices.com.ua/en/diy_geiger_counter_ggreg20_v3_and_esp12-oled_wiring_diagram_en/