I can't believe how much extra money I've given the post office in my life. If you think about it, every time you mail a large envelope and just stick on a bunch of stamps without knowing the exact weight and cost, you've probably overspent as many times as I have. Well, no more. I recently purchased the **Stamps.com 5lb. Digital Scale**. My days of throwing money away are over. This lightweight digital scale is incredibly simple to use. I inserted the 9-volt battery (included) and was ready to go. Place the scale on a firm flat surface (like a desk or table) and then press the ON/OFF button. The display will flash and set at "0.00," which means it's ready to use. I then put the letter or small package on the scale and the LCD display shows the weight of the item. At the US Postal Service website - **http://postcalc.usps.gov/** - you can enter the weight and zip code and find out exactly how much your mailing costs. Simple. When I have to weigh a larger envelope, the top panel flips open to give more room to hold the package upright. In addition, if I have a larger item blocking my view of the LCD screen, simply pressing the HOLD button keeps the weight on display so I can read it once the item is removed. There is even a TARE function that allows you to weigh liquids and very tiny objects. I've never personally used it, but it's nice to know I have the option. So far I've not had any more returned mail due to insufficient postage, nor have I overstamped any packages "just to be sure." The only downside is that the scale is a standalone product; it does not integrate with any postal software or online printing services. The scale can be purchased separately at Stamps.com for about $50, or you can sign up for their service and get it free as part of their ongoing promotion. I bought mine brand new on Ebay for about twelve bucks, and it's probably already paid for itself. There is an available AC adapter that you can buy for about ten dollars, but the battery has worked fine for my infrequent usage. I've had no problems with this product.