Repeat positioning measurements, the data is accurate and stable. Made of aluminum alloy profiles, alloy die-casting, corrosion resistant. This ruler is suitable for JCS900-2AE/JCS900-3AE digital display. Compact and practical design makes it work more stable. 5um accuracy and resolution for convenient and accurate measuring. Item Type:Linear Scale Material:Aluminum Alloy Model:JC800 Accuracy:+-5um Resolution:5um Type:Linear Scale Measuring Range:(Optional) 0200mm and 0350mm 0200mm and 0400mm 0200mm and 0450mm. 2 x Linear Scale. 2 Set Mounting Accessory. We will reply your message within 48 hours. If you do not receive our reply within 48 hours, pls. Post a message again because sometimes our message system may block some emails. If you are satisfied with our service, pls. Our aim is to provide Level Customer Service, your recognition will encourage us greatly and serve you better. We strive to keep all our customers satisfy. We will do our up most to exceed your expectations in customer service, communication and dispatching of your orders.