What unit can I purchase, without add ons, to get six zones? All other models from other companies offer at least six. Thanks,

The Rain Bird ESP4ME3 will cover up to ten zones and doesn't require any additional equipment unless you want to add WiFi capability which is very nice and all functions and programming can be done from a smartphone. I am not knowledgeable about other brand controllers, only the Rain Bird. Hope this helps.

Can i get the manual (as a pdf file) for the esp-me3 4 statation controller ?

You can download this from the manufacture's site. Rainbird

In the manual it says it’s not compatible with hunter psr22 pump start relay. it’s only compatible with specific rain bird pump start relays...??

We know they do work with other brands of pump start relays like the Hunter PSR22 however "officially" I can only say that the Rain Bird manual states otherwise.

Is this for the esp4me3?? i ordered it and you sent me esp-tm2

Yes, this listing is for an ESP4ME3. If a ESP-TM2 timer was sent then Amazon themselves made a mistake as these are FBA (fulfilled by Amazon). Please contact me directly to resolve any issues.