Plain-language explanations of the measurements, sensors and numbers behind environmental monitoring.
A depth converts a sealing claim into a pressure in kilopascals and a duration converts it into a leak rate, which together turn a category into something you can check against your own job.
Read Article→IP67 certifies that a sample enclosure survived one thirty minute dunk in still fresh water, which is not the same as permission to operate a probe submerged.
Read Article→An IP code is two independent test results written side by side, a solids digit and a liquids digit, and neither digit implies anything about the other or about the tests below it.
Read Article→A focus window of two to ten centimetres is also a reach limit and a frame width limit, which rules out anything that cannot be approached within a hand span and anything that has to be judged from closer than a thumb length.
Read Article→Display size and sensor count appear in the same line of most listings, and only the sensor count limits what an instrument can resolve, so the test is whether new detail appears when you close the distance.
Read Article→Autofocus needs a moving lens group, an actuator and a feedback loop, and none of that fits behind a probe tip a few millimetres across, so the nearest substitutes are a second fixed lens or a manually focused instrument of a different kind.
Read Article→The lens on an inspection probe is bonded at a fixed distance from the sensor, so there is one band of sharpness set at manufacture, and no control on the handset can move it.
Read Article→Four way steering bends the tip on two axes, which sweeps a cone rather than a sphere, and the figure 360 in these listings describes the bearing the bend can be aimed at rather than the view the camera returns.
Read Article→A clip on mirror turns the view ninety degrees for nothing and no moving parts, and pays for it in light, in working distance and in knowing which way the tip is facing.
Read Article→A tip that keeps its angle after you release the control frees one hand, makes a view repeatable and removes the slow drift that spoils photographs, and almost no listing in this class states whether the head locks at all.
Read Article→Articulation figures describe how far a tip turns away from straight ahead, and the useful capability begins only once the angle passes perpendicular.
Read Article→Steering the tip and adding a fixed side lens solve the same sideways viewing problem by different means, and each takes its payment from a different part of the instrument.
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