You will find that installing a General Purpose Relay does not require special tools in most hobby projects.
2PK Relay 12VDC 4RD-960388-06 4RD-960388-22 4RD-960388-31 Compatible Replacement
The timer is a nice touch for those who want a bit of automation without complexity.
You will find that the Relay Bypass Switch Kit helps keep things steady during long test sessions.
A nice touch is how ATC DIVERSIFIED ELECTRONICS addresses common application needs without unnecessary complexity.