Aquael's Platinium Heaters represent the latest in digital aquarium heating technology. These fully digital heaters are computer calibrated for utmost precision. Platinium Heaters are crafted with innovative glass and feature a high-precision electronic thermostat, allowing temperature settings between 20 and 33 °C with an accuracy of 0.8 °C. They include a one-touch system for easy temperature adjustment, a ceramic heat sink, and an embedded electronic thermometer. Each undergoes rigorous computer-assisted testing at Aquael's laboratory for reliability. Product Advantages: Wide-range, high-precision electronic thermostat (+/- 0.4 °C) Fully electronically controlled thermostat, eliminating mechanical parts Display of current water temperature and set temperature Each unit undergoes computer-assisted testing and calibration for precision and safety.