It all depends on what you are measuring. One could use any of the following:
Yard stick
Ruler
Teaspoons
Tablespoons
Cups
Miles
Kilometers
Meter
Pounds
Liters
Compass
Stop Watch
Gallons
Quarts
Pints
Ounces
Minutes
Hours
Seconds
Days
Months
Years
The list goes on and on...
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It is a protractor
A ruler or a tape measurer
They cannot be because of errors that can be made by the measurer, calibration of instruments.
Yes, you can typically take a laser distance measurer in your hand baggage when flying, as it is generally considered safe and permissible by airlines and aviation authorities. However, it's always best to check with your specific airline and the regulations of the departure and arrival countries, as restrictions may vary. Ensure that the device is easily accessible for security screening.
Well what I use is a trusty tape measurer! Before you measure the bed though, you should know how much space you have. It would be horrible to get the wrong size bed!