Plain-language explanations of the measurements, sensors and numbers behind environmental monitoring.
A hygrometer measures humidity; a barometer measures atmospheric pressure. Most indoor buyers want a hygrometer, and the products that combine both are usually barometers with a humidity readout added.
Read Article→A hygrometer measures water vapour in air; a hydrometer measures the density of a liquid. This page explains the difference, the units, and when each instrument is the right tool.
Read Article→An I-V curve tracer diagnoses module performance electrically, while a thermal camera locates heat; neither replaces the other for hotspot work.
Read Article→A ground fault locator identifies which string or conductor is leaking to earth; an insulation resistance tester measures how badly it leaks. Most PV fault finding needs the insulation test first, and a locator only when the array is too large to isolate section by section.
Read Article→This page explains what a string tester measures, what a module level tester measures, and how to tell which one your fault-finding requires.
Read Article→This page explains the physical difference between illuminance and irradiance, the spectral and geometric reasons a lux reading cannot be converted to watts per square metre, and the cases where each instrument is the right one.
Read Article→This page explains how a PV insulation tester differs from a general insulation tester, when the general one is enough, and where it stops being safe or meaningful.
Read Article→The difference between a solar clamp meter and a standard clamp meter is DC current capability and DC safety rating, and only one of those is negotiable.
Read Article→A PV tester verifies safety limits and single operating points, while an I-V curve tracer sweeps the whole voltage-current relationship so you can see shape, not just endpoints.
Read Article→An irradiance meter quantifies incoming sunlight in watts per square metre; a PV module tester quantifies the electrical output of a panel, so the choice depends on whether you are diagnosing the sun or the panel.
Read Article→A comparison of ultrasonic leak detection and gas sniffing: what each measures, where each fails, and how to decide which to carry.
Read Article→A practical comparison of ammonia detectors and general combustible gas sniffers, covering sensor type, cross sensitivity, calibration and the cases where neither instrument is the right answer.
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