Bio-Clean Green Thermometer. Environmentally clean. Made of premium glass with 3 point calibration for greater accuracy. Filled with a true organic alcohol, green color. 12" long with indelible , fine graduation; 1 mark = 1 degree. Serial numbers for easy reference. Includes roll guard and reusable storage tube. Great for calibrating your other thermometers and for the still spirits super reflux condenser. Shows F and C.. Range is 0 deg F to 230 deg F. and -20 deg C to 110 deg C.