**We do not offer a Hatch Rate Guarantee (honestly anyone who does is a scam),  too many factors go into hatching chicks. I have hatched eggs from each set before allowing them to be available as hatching egg breeders. I keep a 5:1 or less hen to roo ration for fertility. **  Viability begins to greatly decreases 10 days after the egg is laid. Be sure you are ready to incubate immediately after your eggs have been allowed to rest. 

We recommend a temperature of 99.5 degrees F and humidity of 45% or less for incubation and 55-60% at lockdown.

If you decide to candle your eggs, we recommend candling the eggs on lockdown. For quail eggs, a dark egg with an air pocket is developing. We do not recommend inverting the egg with the blunt-end down while candling. Always keep the air cell in the blunt end upright whenever possible. Handle the egg as little as possible. We personally do not candle. 

Once you have placed your eggs in lockdown (on day 14 for quail, day 18 for chickens), do not open the incubator, especially if the eggs have pipped (cracked). Doing so creates rapid changes in humidity that can cause the membrane inside the shell to stick to the chick, which can suffocate it. Leave the chicks in the incubator while they are all hatching. Chicken chicks can survive in the incubator for up to 72 hours, quail chicks should be removed in 48 hours or less - 24 is preferred.