One of the most common problems we come across in 2D barcode reading is what to do when you find that your -80 freezer has put a layer of ice crystals on the bottom of your rack of 2D coded tubes.  2D barcode readers are all optical devices – they need to be able to ‘see’ the barcodes on the bottom of the tubes, otherwise they don’t work!  Rather than change your tubes to costly alternatives we can show you how to handle this.