The internal DIP switch (DSW1-3) determines output behavior; turning it OFF sets it for a weld checker (like the MM-356A), while turning it ON enables flicker output.
The CY-210B is a tester , not a monitor . Leaving the metal probes in wet soil for days will corrode the copper and ruin the meter. Test, record, remove, wipe clean.
The controller must be properly grounded to prevent electric shock.