This thermometer is ideal for use when making jam and confectionary and has easy to read figures and temperature is given in fehrenheit and centigrade a waterproof stainless steel design with glass tube that can easily be attached to the maslin pan that we stock using the spring clip on the reverse of the thermometer markers to show soft ball hard ball caramel jam etcr not suitable for use in conventional or microwave ovens stainless steel measures 40c 200c