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Environment Testers


  • testo 545 - Light meter


    • Precise light intensity readings in lux.
    • Large memory of up to 3,000 readings.
    • Selective / time-based averaging.
    • Measuring site management with optional software: up to 99 measuring sites available.

  • testo 549 - Digital manifold


    • 60 refrigerant profiles stored in the instrument.
    • Rugged design and housing with 5 year warranty with registration.
    • Large 2-line backlit display.
    • Digital accuracy performs more reliably than analog manifold gauge sets for more precise readings.

  • testo 549i - Refrigeration pressure wireless Smart Probe


    • Measures high-side or low-side refrigerant pressure (or both simultaneously, with 2 probes) in AC and refrigeration systems.
    • No hoses required; clean, simple, and accurate.
    • Low-loss refrigerant pressure testing!.
    • Use with the testo 115i pipe-clamp temperature probes for automatic superheat and subcooling calculations.

  • testo 550 - Digital manifold kit with Bluetooth


    • Bluetooth / app integration for monitoring, report generation, and sending reports and invoices via email (range of 65 feet).
    • 2-way valve block with three connections.
    • 60 refrigerant profiles stored in the instrument.
    • Simplified menu structure using ESC key.

  • testo 552 - Digital vacuum / micron gauge with Bluetooth


    • Precise and reliable vacuum measurements, 1 micron resolution.
    • Displays the saturation temperature of H2O to ensure full and proper evacuation.
    • Illuminated, backlit display with visual alarm for evacuation pressure.
    • Wireless Bluetooth communication to smartphone or tablet provides powerful analysis and reporting to display data, create reports, and send via email or SMS.

  • testo 605-H1 - Compact thermal hygrometer


    • Slim form factor is convenient for duct or ambient measurements.
    • Resilient Testo patented humidity sensor ensures long life.
    • Rotating display allows for easy reading of measurements.
    • Quick response sensor provides fast readout of measurements.

  • testo 605i - Thermo-hygrometer wireless Smart Probe


    • Quickly and accurately measures relative humidity and temperature in rooms, ducts, and chambers.
    • Automatically calculates dew point and wet bulb temperature.
    • Small diameter probe is ideal for in-duct measurements.
    • For all HVAC/R technicians and contractors.

  • testo 606-1 - Moisture meter


    • Precise moisture measurements in wood / cement etc.
    • Characteristic curves for wood / building materials.
    • Hold function: freezes the last reading for convenient use.
    • Backlit display for use in all lighting conditions.