The Mini Click II is the best selling rain sensor in the world. It measures rainfall through moisture absorbing (hygroscopic) disks. There is no collection cup to clog up so it requires no regular maintenance.
You can set the sensitivity to allow 1/8, 1/4, 1/2, 3/4 or one inch (25mm) of rain to fall before it switches the system off.
The housing is made of UV resistant thermoplastic, and the mounting bracket is aluminium, so this unit is built to last.
Unlike sensors that are buried in the ground to measure soil moisture the Mini Click II will not get in your way, it is mounted safely above ground, often on the side of a building.

This check valve has two functions. Primarily to prevent water draining back from your system into your household supply. In addition it can be used to stop water flow unless a preset pressure is reached. It can be set to open at any pressure, from 1.7 to 14 psi. Useful on overhead irrigation systems, it prevents water held in the suspended pipe work from leaking through the emitters after operation.
Install it in-line just before the first outlet for maximum effect. Also for 13mm systems to prevent water retained in pipework from draining down slopes and causing flooding, through spray heads, pop-ups etc.