Have you ever been worried by a leaky tap? It freaks me out - more than a fly squirming at the nape of my neck on a warm, sweaty day in the tropics. I heave a sigh of relief only when I see a field service technician deftly twitching the screw and putting a new washer in place.

Thanks to the tribe of the field service experts, their instruments, and the sheer skills that they possess in making households, offices, shops, and businesses stay sane.