Plenty of jobs don't start with a circuit diagram. They start with a complaint: the office feels stuffy, the motor sounds wrong, there's a damp patch nobody can explain. Extech makes the meters that turn those hunches into numbers, and many of them keep a record while you get on with something else.
Take that damp patch. The RH550 is one of our thermo-hygrometers with a built-in dew point and mould detector, so it'll sound an alarm when a room is heading for trouble rather than after the mould appears. Chasing a stuffy office or a struggling air handling unit? The SDL350 anemometer measures airflow and logs it straight to an SD card, ready to open in a spreadsheet when you're back at your desk.
The same idea runs through the SDL200, which logs four thermocouples and two RTD probes at once. That's handy when you need to prove a cold store, an oven or a process line stays in spec overnight, not just when someone happens to check. Browse our wider range of thermometers for quick spot readings.
For the electrical side, the MA445 is a true RMS clamp meter that reads up to 400A AC or DC without breaking into the circuit. The EX355 multimeter adds a Lo-Z mode, which drains away the ghost voltages that can make a dead circuit look live. Not sure which meter suits your work? Our guide to the best multimeter for professionals walks through the options. And when the motor itself is the question, the RPM33 measures its speed by laser from a safe distance or by contact.
Extech earns its place in the lab too. The waterproof EC500 checks pH, conductivity, salinity, dissolved solids and temperature in one meter, so a single instrument covers a water treatment check or a whole environmental science practical. See our full range of pH meters, or get in touch if you'd like help picking the right meter.
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