I recommend measuring, because “700x500 laser” isn’t specific enough to know the exact dimensions from the bed at your laser’s focus point to the inside of the open lid, and if your machine has a different lid stop position than mine, or you have a shorter focal length lens, you could end up with the wrong camera.
If your machine is a 700x500 I even did all the math for you already on the post Rick linked to above (What is the best camera lens to choose for my bed size?).