9V Battery Holder

This 9V battery holder allows your battery to snap in tight and holds it in place, which is great in situations where you don’t want the battery just hanging. It also has three mounting holes so you can attach it securely to your enclosure.

It is terminated with a standard 5.5x2.1mm, center-positive barrel jack.

High Precision Atmospheric 3.3V BMP280 Pressure Sensor Module Breakout Board Replace BMP180 BMP085

ME-BME280 is a Breakout Board featuring a Bosch Sensortec ME280 Temperature, Humidity & Pressure Sensor. 
The board has selectable I2C address jumper (solder link GS2), I2C pull-up resistors, 7 pin header 2.54mm, and two mounting holes 3.5mm.
Default setting of the board; single power rail Vdd=Vdd_IO (solder link GS1), pull-ups resistors (R2, R3) 10k, protocol selector resistor 0ohm (R1), decoupling capacitors 0.1uF on both power supply pins Vdd & Vdd_IO.