36mm Waterproof Seiko Thermometer Movement with Black Dial • Quality Seiko Thermometer movement. • Bezel Diameter 36.6mm fitted with Silicone rubber gasket. • Luminescent hands and markers on the dial. • Stainless Steel cases. Instruments feature stainless steel cases and mineral glass crystals. (Heavy-duty components, no cheap plastic here!). • Rugged instruments. These gauges are designed specifically for Motorcycle/ATV/Marine installations and are warranted against Vibration, Water and Shock.