if you go reverse does it subtract for you?

Yes it will roll off numbers. Great for measuring long areas. I have bought two of these for our use.

Has anyone used this on a graded dirt road? thanks in advance for your answers.

The unit will work on varied and rough terrain and for infrequent use, is a decent unit. My issues with this unit is that the axle housing and counter are not very sturdy and in my case, the unit was wore out in 6 or 7 months. I use my wheels daily to measure existing homes and businesses on all types of surfaces, sometimes as many as 40 homes a day. Once the axle gets "sloppy" from use it no longer counts accurately and is hard to reset the counter. For lighter duty service than what I do it will suffice. Also keep in mind that I have used many measuring wheels; different models and manufacturers, and have yet to find one that survives to the end of the warranty with the volume of work I do with them. I average wearing out two wheels per year. Hope this helps!

Brand	Keson
Material	Aluminum
Item dimensions L x W x H	23 x 16 x 10 inches
Item Weight	3.13 Pounds
Screen Size	5 Inches
UPC	733353794172 786714856170 787721803058 052837008506
Global Trade Identification Number	00052837008506
Manufacturer	Keson
Part Number	RR318N
Item Weight	3.13 pounds
Product Dimensions	23 x 16 x 10 inches
Item model number	RR318N-2
Is Discontinued By Manufacturer	No
Size	Large - Circumference: 3 ft
Color	yellow
Style	Units: ft., in.; Diameter: 12-1/2 in.
Item Package Quantity	1
Batteries Included?	No
Batteries Required?	No
Warranty Description	1-year
National Stock Number	4920-01-611-4500

RR318N Contractor Grade Measuring Wheel, Ft. & In., Ft. & In., 12-1/2-Inch Diameter, Orange, Large - Circumference: 3 ft

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