We are often asked which cases are available for use with the Raspberry Pi and our development boards.
Over the past four years, we have purchased many different cases and designs to test with our boards, and the only case we have found which will fully enclose the Raspberry Pi and up to two of our development boards is a DIN rail mounting case from Italtronic.
The photos below show a Raspberry Pi fitted with an IO Pi Plus with an open and closed case. The clear front section of the case can be removed to allow wires to be connected to our boards, or you can cut out spaces on the sides if needed to use with our Serial and RS458 boards.
Raspberry Pi B+, Pi 2 B and Pi 3 Model B DIN Rail Modulbox Enclosure

We purchased the case from RS Components (part no: 8607577), and the case is also available from other suppliers worldwide.

You can also use the Pibow cases from Pimoroni in the United Kingdom with the top layers removed: Pimoroni.
Also useful for your Raspberry Pi project
Temperature & Sensing
1 Wire Pi Plus
Connect dozens of 1-Wire sensors - temperature, iButtons, EEPROMs - via a single GPIO pin. Stacks directly on the 40-pin header.
Analogue I/O
ADC Pi
Read up to 8 analogue inputs - perfect for pairing with your temperature sensors or other analogue-output devices.
All-in-one
Expander Pi
Combines ADC, DAC, 32 GPIO ports and a real-time clock on one board. The most versatile board for complex Raspberry Pi projects.