These scales are as good as the best on the market and some for a fraction of the price.I did have to open one to cut-it to match a pre-existing installation. I have to say, I was impress with there quality. Also with the in-expensive DRO I have outstanding precision with out error compensation.Here the good;Solid and think aluminum extrusion.Quality reading head, it's well assemble and have quality components.The mounting end cap are sealThere's two lips seal set to prevent contamination.Contact and connections well protected even inside the DB9 connector.BX wires is flexible and good quality, the length is more than sufficient.Easy to install and dial-in +/- .002" on two axes.Come with an adaptor (DB9 / RS232) to match two different type of DRO connection.The Bad!?! I didn't find any about the scale but the cover could be skinnier and have end-cap. It's funny, order 4 scale and one came with the end-cap !?!I'm recommending this product and I'm impress with the construction, quality and precision. It's easy to install and just need to be plug and play.