The Engineer's Arsenal application is an application in which tools are implemented to help make complex calculations. After downloading you will find handy calculator tools to help you calculate the thermal energy, pressure, fluid flow, temperatures, fluid conductivity and mass. Now I will describe in more detail about all the tools. Thermal energy. With this calculator you can calculate the energy of the pace in different units: calories, joules and watts. For example, if your calculator shows 7 kilocalories per day and you need to know how many kilowatts will be in a month, then this is not a problem. Just select the current readings so that you can read for periods of time, then enter 7 in the calorie field, then select the kilo dimension, after that, you will need to select the dimension of kilo at the watt field and the whole result will be ready. All these actions can be carried out in a different order, the result will be the same. Pressure. Everything here is similar only in the drop-down lists you select the type of value you want to measure. Available Values: Pascal, Newton per mm2, Newton per cm2, Newton per m2, Atmosphere, Technical atmosphere, Kilogram force per m2, Kilogram force per cm2, Bar, Millimeter of mercury, Inch of mercury, Meter of water, Inch of water, Foot of water, Pound per square inch, Kilopound per square inch, Am. ton per square inch, Br. ton per square inch, Pound per square foot, Am. ton per square foot, Br. ton per square foot Fluid flow. This tool counts Liters, Gallons, Cubic Meters and Cubic Feet. You can count the passage of the flow per second, per minute, per hour, per day, per week, per month. Temperatures. There is not much to describe here. The calculator counts the temperatures of different quantities that I found are Celsius, Fahrenheit, Kelvin, Rankin, Newton, Dedil, Roemer, Reaumur. Liquid conductivity. It is commonly used to regulate water quality after reverse osmosis. For example, there are devices that show electrical conductivity in microsiemens, and for the report you need to translate it into parts per million, now this is not a problem. Weight. Simple mass calculation. Available sizes Gram, Kilogram, Pud, Centner, Ton, Ounce, Troy ounce, Carat Further development. There are plans to add many more tools such as calculating Modbus registers and queries, calculating the weight of metal and concrete of various shapes and much more. The trial version may be slightly limited, but not everywhere. I would be glad to receive your feedback and suggestions. Enjoy it.