Conversation

What’s your favorite measuring instrument or sensor? Respond with amazon links or sample of output if possible.
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Things I currently own: Binoculars (2) Telescope Digital thermometer IR thermometer 2 scales (coarse, fine) Rulers, protractors, tape pH strips Pendulum clock kit I need to build Multimeter (on the way) Soil moisture sensor Level Stud finder Shopping list Digital microscope
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Replying to
Have not decided yet. Probably something easy to build and see if we are fascinated enough to build a more advanced one. Make toys/figures mostly. Maybe some math/engr concept toys. Maybe impossible chocolate treats...