All MARINA AQUARIUM HEATERS MARINA AQUARIUM HEATERS Aqua One AquaNano 40 Nano Glass Thermometer Small 10310£2.82 Aqua One Digital Thermometer 10307£2.39 Aqua One Glass Thermometer£1.99 Aqua One heater protector / guard 10298£8.36 Aqua One Premium Glass Thermometer 15cm 10309£3.34 Aqua One Suction Cup – Glass Heater 25-300 Watts, Aquis 2200/2400 (2/pk) 45112£3.49 Fluval Aquarium Submersible Digital Thermometer 11195£8.25 Fluval Aquarium Wireless 2-in-1 Digital Thermometer 11193£9.96 Marina Floating Thermometer with Suction Cup , Celsius and Fahrenheit 11201£2.23 Marina LCD Aquarium Thermometer, 19 to 30° C (66 to 88° F) 11226£2.23