I have owned these scales for about five years. They are accurate and have been very durable. I had to buy a new one as my Daughter borrowed the original scale and forgot to return it. I highly reccomend these but you have to be able to support the weight of your bag by holding the ring on top of the scale. I find this difficlt so I hold the body of the scale and it has workrd fine (but this is not reccomended in the instructions). I would estimate they are are accurate to a few 100 grames, which is fine for my use, through they read to the nearest 10 grame. we use them about 10 times a year for our four bags and in five years have only had to change the batteries once. I think this is partly due to the auto shut off which prevents the device being turned on in transit and fully draining the battery.