I bought two Taylor 330 pound scales at Wal Mart. I think they were around $40 each. We have a very accurate, but not very mobile, digital scale for weighing pallets at work so I brought about 350 pounds of cement blocks to work to calibrate the scales. I weighed all the blocks and wrote the weights on them. Then I put blocks on the scale and turned the adjustment on the scale to calibrate it at about 350 pounds. I found that you can't just adjust the scale at zero and expect it to be accurate at 350 pounds (It was about seven pounds off if I remember correctly), but with it adjusted at 350 pounds I could add and remove blocks in the range of 300-400 pounds and have it always read with an accuracy of about one pound. I brought all the marked blocks with me to the airport so I could double check the calibration before and after weighing the plane.
I was looking for a link for the model I have and I came accross two other Taylor scales that are rated for 400 pounds, which means that they will likely be accurate to at least 450 if they are calibrated. Here is the link: http://www.housewarereviews.com/Bath/Bath_Scale/Bath_Scale_10.html. The models ate the 0906-6072 and 0907-6072. I don't know what the model number of the 330 pound one I have is since it is not written on the scale, but it looks like the 400 pound models. If the like doesn't work, just search Yahoo for taylor 400 scale or taylor 330 scale. There are a bunch of links. I used a small digital bathroom scale I found at Wal Mart for the tailwheel because it read to .1 pound and gave me accurate readings down to 15 pounds. Mark Langford wrote: NetHeads, WW's revelation that there was such a thing as a 400 pound "freight" scale got me looking. I'd been looking for inexpensive scales with more than a 300 pound range for months, but searches turned up thousands UNDER 300, which are hard to sort through. I found the jewel below at Office Max for $140 (see link below), which is a whole lot less than the thousand bucks I was used to seeing for "real" scales. This thing looks perfect for engine
