Finished my Auto Topoff!

[mr_alberta]

Solid state relays just look like tiny black boxes with prongs sticking out the bottom (well all the ones I've ever seen were). A mechanical relay usually has a clear portion on the top where you can see the "guts" of the relay.

[beaker020]

If it goes "click" it aint solid state. many of the mini mechanical relays are in sealed black cases.

[KrazyKuch]

The color of the case has nothing to do with it......If you look on the case it will say Coil Voltage, those are mechanical!!!