Citizen Promaster Sky Eco Drive NightHawk BJ7010-24W/BJ7010-17W Men’s Watch

A very different, useful, geek-features-laden and durable watch for an outdoorsman. For others, it is plain everyday comfort. The multi-functional slide rule is a much praised thing among the mechanically-slanted, wheel (or propellers)-whirring crowd; with this, you get info on fuel consumption, mph and estimated time of arrival. Other than that, you can simply multiply and divide numbers, do ratio/percentage conversions (even with integers and decimals) and find things out in metric units. The slide rule also allows changing that into other forms.