Extech Temperature & Humidity
Accurately measuring ambient air, surface temperatures, and moisture levels is critical for ensuring safety, efficiency, and comfort in any facility. Extech offers a comprehensive suite of professional-grade temperature and humidity instruments designed for HVAC/R technicians, plant maintenance engineers, and food safety inspectors. From precision non-contact infrared thermovision to rugged thermocouple thermometers and rapid-response psychrometers, Extech equips you with the exact diagnostic tools needed to trace thermal anomalies, balance mechanical systems, and prevent hazardous environmental conditions.
Infrared (IR) Thermometers
Safely diagnose overheating components, electrical panels, and HVAC vents from a distance with Extech’s non-contact IR thermovision tools.
IR400 Compact Laser IR Thermometer: A compact point-and-shoot thermometer with an 8:1 distance-to-spot ratio. Measures from -4 to 630°F (-20 to 332°C) with a fixed 0.95 emissivity and MAX/MIN display.
42510A Compact Laser IR Thermometer: Offers a wider 12:1 ratio and an extended temperature range of -58 to 1200°F (-50 to 650°C). Includes adjustable emissivity and high/low audible alarms.
IR270 IR Thermometer with Color Alert: Features a programmable tri-color backlit LCD that flashes red or blue when temperatures exceed or fall below user-set alarms. 12:1 ratio; measures up to 1202°F (650°C).
IR320 Waterproof IR Thermometer: An IP65 waterproof and 3-meter drop-proof thermometer built for harsh environments. Features a dual laser pointer, 12:1 ratio, and visual LED alarms up to 1202°F (650°C).
IR267 IR Thermometer with Type K Input: Combines non-contact IR capabilities (-58 to 1112°F) with a standard Type K thermocouple input for contact measurements. Measures ambient air temperature natively.
42512 Dual Laser IR Thermometer: Delivers pinpoint accuracy with dual converging lasers and a 30:1 ratio. Fast 150ms response time captures rapid temperature spikes up to 1832°F (1000°C).
42545 IR Thermometer with Alarm: Features an ultra-high 50:1 distance-to-target ratio for measuring very small surface areas at great, safe distances. Measures up to 1832°F (1000°C).
42570 Dual Laser IR Thermometer: A high-capacity 50:1 IR thermometer that measures extreme heat up to 3992°F (2200°C). Includes a Type K input, 100ms response time, and a USB PC interface.
VIR50 Video IR Thermometer: An advanced 50:1 thermovision tool featuring a 2.2-inch Color TFT LCD and a built-in camera that captures JPEG images and video to a microSD card. Measures up to 3992°F (2200°C), plus humidity and air temperature.
Thermocouple Thermometers
Durable, contact-based temperature meters for direct thermal analysis and differential monitoring.
TM100 Type J/K Thermometer: A single-input thermometer with side-mounted controls for one-handed operation. Measures from -328 to 2501°F (Type K) with 0.1° resolution.
EA11A EasyView Type K Thermometer: A single-input meter featuring a large dual LCD that simultaneously displays current temperature alongside Max/Min/Avg data. Stores up to 150 readings.
EA10 EasyView Type K Dual Input Thermometer: Features dual thermocouple inputs for calculating T1, T2, or T1-T2 temperature differentials. Includes a built-in timer for tracking elapsed time during tests.
EA15 EasyView 7 Thermocouple Datalogger: A dual-input datalogger supporting 7 distinct thermocouple types (K, J, T, E, R, S, N). Stores up to 8,800 data sets internally for manual or automatic recording.
Food Safety & Pocket Thermometers
NSF-certified and splash-proof tools designed specifically to maintain public health standards in the food industry and agriculture.
TM26 Waterproof Food Thermometer: NSF certified with a 4.1-inch stainless steel penetration probe on a 5ft cable. IP65 waterproof rating; measures from -40 to 392°F (-40 to 200°C).
TM55 Pocket Fold-Up Food Thermometer: NSF certified and dishwasher safe (IP65). Features a 2.4-inch folding stainless steel probe with an antimicrobial additive; measures from -40 to 482°F.
TM20 Waterproof Temperature Indicator: Features a 0.78-inch stainless steel probe on a 9.6ft cable. IP65 rated; includes audible/visual alarms and measures from -40 to 158°F (-40 to 70°C).
39240 Waterproof Thermometer: A compact, pocket-sized thermometer with a 2.75-inch stainless steel stem. Measures from -40 to 392°F with MAX/MIN recording.
401014 Indoor/Outdoor Thermometer: Features a large 1-inch digital display for indoor/outdoor monitoring. Outdoor range is -58 to 158°F via an external probe on a 9.6ft cable.
401014A Indoor/Outdoor Temperature Alert: Includes all the features of the 401014, adding user-programmable High/Low audible alarms specifically for the outdoor/external temperature probe.
Hygro-Thermometers
Monitor ambient temperature and relative humidity to ensure optimal environmental conditions and detect the risk of static or mold.
445703 Big Digit Hygro-Thermometer: Simultaneously displays temperature (14 to 140°F) and humidity (10 to 99% RH) on a massive 1-inch digital LCD with built-in sensors.
445715 Remote Probe Hygro-Thermometer: Similar to the 445703, but utilizes a remote probe on an 18-inch cable for reaching into ducts or enclosures. Features a rear calibration adjustment pot.
445814 Humidity Alert: Features programmable audible and visual alarms that warn users when ambient conditions are ideal for mold growth or static electricity. Displays dew point.
445815 Humidity Alert II: Incorporates the programmable mold/static alarms of the 445814 but utilizes a remote probe on an 18-inch cable for targeted area monitoring.
445713 Indoor/Outdoor Hygro-Thermometer: Monitors internal room temperature and humidity, while simultaneously tracking outdoor temperature via a remote sensor on a 35-inch cable.
CTH10A Wall Mount Clock/Calendar + Hygro-Thermometer: A large 4.3-inch digit wall clock that receives the NIST Time Code for absolute accuracy, while constantly displaying ambient temperature and humidity.
RH200W Multi-Channel Wireless Hygro-Thermometer: A wireless base station that can connect with up to 8 remote transmitters to monitor temperature and humidity up to 98ft (30m) away.
RHM15 Mini Hygro-Thermometer Monitor: An ultra-compact monitor ideal for small spaces like server rooms, humidors, or instrument cases. Records high and low extremes.
445580 Humidity/Temperature Pen: A pocket-sized, digital hygro-thermometer pen with a built-in self-calibration utility. Ideal for field HVAC use.
RH101 Hygro-Thermometer + IR: A multi-tool combining a remote humidity sensor on a 39-inch coiled cable with a built-in 8:1 Non-Contact IR thermometer for surface readings up to 932°F.
Precision Psychrometers
Highly advanced IAQ tools designed to calculate dew point, wet bulb, and mixing ratios for complex mechanical and HVAC repair.
RH300 Digital Psychrometer: Simultaneously displays %RH, Temperature, and Dew Point or Wet Bulb. Calculates T1-T2 differentials using an optional external probe.
HD500 Psychrometer + IR: A heavy-duty combination meter featuring a 30:1 IR thermometer (up to 932°F), Type K input, and a precision psychrometer with 2% RH accuracy. Includes USB software.
RH350 Dual Input Psychrometer: Features two Type K external probe inputs specifically for calculating superheat differential measurements (T1-T2, Air-T1). Stores 99 data points.
RH390 Precision Psychrometer: Delivers the highest 2% RH accuracy with a rapid 30-second response time. Features a slim, rubberized design ideal for one-handed field operation.
RH490 Precision Psychrometer: Built on the RH390 platform, this unit adds the ability to measure moisture in Grains Per Pound (to 1120 GPP) or grams per kilogram for advanced water restoration diagnostics.
RHT510 Digital Psychrometer: Features a Type K input for extreme temperature measurements up to 2372°F (1300°C), while simultaneously calculating Wet Bulb and Dew Point from the ambient environment.