Yes, the aperture is large, it can gather more light. If you want better images, consider getting some filters. 

No. This is not a high range tailpipe analyzer. This is an ambient air analyzer for worker exposure. 

The telescope's objective and eyepiece lenses feature BAK4 prisms and multi-layer coatings for a great viewing experience. 

The binocular shell is made of environmentally friendly, odorless rubber material. The surface of the binoculars is nicely matted and effectively prevents slipping. 

(1)Please check to make sure you have installed 1.5V 6*AA battery. Do not use inferior batteries as their voltage is lower than 1.5V. (We recommend brands like Energizer, Duracell, AmazonBasics, etc.). (2)Make sure the polarity is correct and the contact with the spring is normal. (3)Press and hold the power button for at least 3 seconds to power on. (4)If it still cannot be turned on after 1-3 steps, please try to use a power bank.