JBL Aquarium Thermometer MiniPrecise measurement for healthy fish: mini-thermometer with fine graduation every 2 degrees.Easy to use: suction cup attachment (also suitable for attaching the JBL CristalProfi m internal filter).Safety assured: non-toxic blue colored alcohol filling (instead of mercury).Scale from 0 to 50 °C.Included in delivery: mini-thermometer for aquarium.