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Don't go there, you will get very wet!
The 7-segment display is a simple device that allows you to display any number 0-9, hexadecimal numbers A-F, and some other letters and characters, using 3 horizontal segments and 4 vertical segments. The segments have letters assigned to each as shown in the picture. (Most displays will also have a decimal point, labeled DP in the picture.) The numbers are formed by lighting combinations of those 7 segments. For example if you apply voltage to the pins on segments A, B, G, E, D, on the displays shown above you will display the number "2". Seven segment displays are ubiquitous. They are so common that most people would not even notice that the characters are made up of 7 segments. From pocket calculators, digital clocks and thermometers to gas pumps, road signs, billboards, and a myriad of other devices large and small, information is conveyed through seven segment displays. There are two common types of 7-segment displays, LED (light emitting diodes) and LCD (liquid crystal displays). Displays today are often of the LCD type while LED types were used extensively in the past. Seven segment displays do not have to be red. They come in a variety of other colors such as green, blue, yellow, etc. While we might think of 7-segment displays as a rather modern invention, F. W. Wood invented the concept of seven segment numbers in 1908 as found in the Patents; however they came into widespread use in the 1970s.
BYOP, container has only a log and a 7-segment display (not a swap item!). Bring along a 9v battery if you want to see a LED display counter in action--Update 4/11/2022: The 7-segment display went missing. I plan to replace it when I get a chance.
This puzzle relates to the 7-segment common cathode LED display only:
1, 2, 9, 4, 6
7, 4, 2, 9, 10
10, 1, 2, 9, 7
1, 7, 10, 9
9, 4, 1, 6, 2
2, 1, 9
You can validate your puzzle solution with certitude.