i was thinking of useing a battery time clock on the trailer and have cards made for each property that has trimming , mowing ,edging ,blowing ,and cleanup that you could use at least four times . each time you grab a tool clock in . this would help with estimating other jobs . any other thoughts? i have tryed the pen and paper but it became a hassle,forgot to write time down or spend to much time wondering what i done with that pen and the whole time its behind my ear or some thing.