but a handheld meter is ideal for the most accurate results. While there are only two types of light to measure (incident and reflective), there are three types of meters a photographer can use ...

Both our electrical meter and our gas meter are located ... which picks out the packets from a reasonably large list of meter types, and pushes them through the USB interface.

The "Smart Meter Market by Type (Electric, Gas, Water), Component (Hardware, Software), Technology (AMI, AMR), Communication Technology (RF, PLC, Cellular), End User (Residential, Commercial, ...