I bought the scales off of amazon:
High Precision IP67 Magnetic Scale 5um,Water-Proof,Oil-Proof,Anti-Dust,50-3000mm Magnetic Linear Encoder for Woodworker, Lathe,Milling Machine,Bridgeport (550mm~820mm/22''~32'')
High Precision IP67 Magnetic Scale 5um,Water-Proof,Oil-Proof,Anti-Dust,50-3000mm...