Extech TM20 Waterproof Temperature Indicator, -40 to 250°C, IP65, NTC Thermistor

The Extech TM20 is a waterproof temperature indicator built for reliable spot checks in wet or dusty environments. Its IP65-rated housing and stainless steel probe allow direct immersion or surface contact, while the NTC thermistor delivers a fast response time of under one second across a wide measurement range.

Highlights

• Waterproof to IP65: withstands splashes and dust, suitable for field use.
• Wide temperature range: -40 to 250°C (-40 to 482°F) with ±1°C accuracy from -20 to 120°C.
• Fast response: NTC thermistor reacts in less than one second.
• Data hold and min/max memory: capture and recall extreme readings.
• Auto power off after 15 minutes to conserve battery.

In daily use

The TM20 is a practical tool for HVAC technicians, food safety inspectors, and lab personnel. The stainless steel probe (70 mm) is easy to clean and insert into liquids or semi-solids. The large LCD shows readings in °C or °F with 0.1° resolution. The CR2032 battery lasts about a year under normal use, and the ABS housing is rugged enough for everyday handling.

Full specifications

• Temperature measurement range: -40 to 250°C (-40 to 482°F)
• Temperature accuracy: ±1°C (-20 to 120°C), ±2°C otherwise
• Temperature resolution: 0.1°C/°F
• Sensor type: NTC thermistor
• Waterproof rating: IP65
• Probe material: stainless steel
• Probe length: 70 mm (2.75 inches)
• Display type: LCD
• Measurement units: °C, °F
• Response time: <1 second
• Data functions: data hold, min/max memory
• Auto power off: yes (after 15 minutes)
• Battery type: CR2032 lithium button cell
• Battery life: approximately 1 year
• Housing material: ABS plastic
• Operating temperature (meter): 0 to 50°C (32 to 122°F)
• Sampling rate: 1 second

Final note

Compact and durable, the TM20 is a dependable choice for routine temperature monitoring where waterproofing and speed matter.