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The DT50 manual includes a golden rule: An ounce of prevention saves a pound of repair. Adhere to this schedule:

Short press to turn on or trigger a single measurement. Long press for continuous mode.

You can use the manual as a quick reference. Below are the most commonly searched procedures:

Highly reflective, transparent, or dark matte surfaces can distort the laser signal. Use a piece of white paper as a target plate for these surfaces.

Here are some final insights taken directly from the original DT50 user manual: