Ultrasonic flow meters can either be integrated into a pipe to measure the flow 'in-line' or clamped onto the outside of an existing pipe. Both in-line and clamp-on flow meters are commonly used for ...

If budget matters most, this is a serviceable light meter for film cameras that’ll prove adequate for a newbie film photographer or an enthusiast on a budget. Why you can trust Digital Camera ...

but as cameras with built-in light meters became both more prevalent and reliable, these devices became increasingly obsolete for everyday use. As the digital revolution began to rival film, ...