Comes in handy to shade the digital level lens. Sometimes I write phone numbers in mine. Other times I record an HI and CPt #. Today, a dopey civil engineer told the PC that the track near Disneyland was unused. I axed when did Wilfred become an expert on trains? I know there are other land surveyors that like trains. Scarey sometimes, like that time I recovered a bench mark along the track south of Capo Beach, looked up spotting a Metrolink train flying at me, pondered "would I make it?", then pushed up to that block wall, watched it pass and skipped across the track back to the truck.