Concrete Slide Ruler Volume Computer Calculator 100 Yard

I like it because it's easy to use you use the slide rule when you pull the length on one line and the width on how wide. Once you have them lined up check your depth with those 3 lines matched up then read how many yards you will need. This was a replacement I have 2 I found after I ordered this one. The 2 I had was for 200 feet this one is for 100 feet and the lines are much bigger to read. I mainly use this to tell me how much concrete I will need but I mix mine with raw materials so I know what a yard of concrete weights so what concrete I need I divide it so if I need a 1/2 a yard then I'll use 1/2 the full weight of rock let's say a yard weights 2000 pounds a 1/2 a yard I will need so I need about 1000 pounds of rock. So this is why I use this rule for telling me how much rock, sand and Portland cement I need for the job