Svbony SV172 dew heater strip designed for astronomy telescopes and cameras, protecting optical devices like telescopes and cameras from fogging or freezing.

1. Measure the circumference of the telescope tube or camera lens (or measure the tube diameter - not the scope aperture - ×3.14).

2. The heating element provides even heat distribution.

3. The power-efficient design will not result in an extra drain on your power supply.

4. SV192 prevents dew condensation from forming on the glass surface.