Graphite blocks are PTFE-coated to resist aggressive corrosive attack for guaranteed long life in harsh laboratory environments. Our sample blocks operate with either a SPB Digital Controller (N9300808) or SPB Touch Controller (N9300809). Please select a controller below and the appropriate Start Up Kit (SPB 100-42 200 500 Tubes 2 Racks N9308015) which includes RackLock DigiTUBE®s, disposable watch glasses, DigiFILTER™s and much more. Each SPB Block includes one set of racks.