With the standard 98Wh battery, expect 4–6 hours of active use. Set 7 (oscilloscope) is the most power-hungry, while Set 9 (GPS) can run for nearly 9 hours in logging-only mode.

Given the list of numbers (1 through 13, skipping 5), without context, one might consider:

Portable Application: Data acquisition & e-discovery
One of the most popular units. Set 4 includes a write-blocker, multi-format card reader (CF, SD, microSD, Memory Stick), and two SATA/USB 3.2 bridges. Law enforcement agencies use the portable Webe Model Lacey Set 4 to create forensically sound disk images at crime scenes.

Portable Application: Time synchronization & surveying
Set 9 contains a multi-constellation GPS/GLONASS/Galileo/Beidou receiver with sub-centimeter accuracy. When paired with an external active antenna, this portable unit functions as a Stratum 1 time server for temporary field networks.

Set number 5 is absent from your list. Possible reasons:

Recommendation: If you own a "Set 5," treat it as functionally similar to Set 4 or 6. Otherwise, ignore.