Check the listing for details. Robart SDI Gauge Model #407 (Surface Deflector Indicator ). Condition: New, Made in United States. Listed at 10.00 USD. The Robart SDI Gauge Model #407 is a surface deflector indicator designed for radio control enthusiasts aged 17 years and up. Made in the United States, this product by Robart provides precision and accuracy for pilots looking to enhance their RC model vehicle performance. With this deflection indicator, pilots can easily monitor and adjust their surface deflection in real-time, improving overall control and maneuverability during flights. Ideal for hobbyists seeking quality RC tools and accessories.