Thermometer - Red / Blue Spirit Filled, -0 to 50°C-EIS-PH0471D offers a thoughtfully designed, durable resource for hands-on learning. Yellow enamelled back and reinforced bulbs filled with Red / Blue spirit. General purpose stirring thermometers. Supplied with non-roll fitting. Diameter 6.5 mm approx. and 76 mm immersion. Lines and numbers are permanently fused to glass. Supplied in case.