I'm new to the hobby and just wanted to know what test equipment I need for a test I'm trying to do. Basically I want to find the time difference between two inputs. I have a 12V air control valve and a 5V pressure sensor. I want to engage the air valve and find the time it takes for the pressure sensor to trigger a certain voltage, according to the manufacturer it should be under 15ms, basically from the time of engagement to the sensor detects it. Can the newer digital oscilloscopes take screenshots/freeze frames or calculate the time of two different input triggers? I only have about $400 to spend too.