Spirit and mercury filled, dual scale thermometer, reading in both Celsius and Fahrenheit. Comprises U-shaped specially designed capillary for easy reading of mercury level or steel index pins in the column. Scale, graduated -20 to 50 × 1°C and 0 to 120 × 2°F. Movement of mercury in the U-bend, as a result of expansion or contraction of spirit in both the limbs, forces the respective steel indices to move up along the column. Readings are taken at lower end of indices, whose position can be reset by magnet supplied. Complete weather-proof construction with shade at the top.