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Description
Testo Mini Alarm Thermometer (0900 0530)
The Testo Mini Alarm Thermometer (0900 0530) is a compact yet powerful tool designed for precise temperature monitoring across various HVAC applications. This affordable device features a min./max. alarm function, providing an instant acoustic signal if temperatures exceed or fall below your pre-set limits, ensuring critical conditions are never missed.

Its robust design includes a permanently connected penetration probe with an 80 cm cable, offering flexible placement options for monitoring air, liquids, or soft substances. The main unit is equipped with a versatile clip for easy set-up on desks, wall mounting, or secure attachment to your gear, making it highly adaptable for both stationary and mobile use.
Why It Matters
Accurate and timely temperature data is paramount in HVAC, refrigeration, and industrial processes. This mini alarm thermometer provides an invaluable early warning system, preventing costly equipment damage, ensuring product integrity, and maintaining optimal environmental conditions by immediately alerting you to deviations from desired temperature ranges.
What's Included
- Testo Mini Alarm Thermometer (0900 0530)
- Permanently connected penetration probe (190 mm length, 3.5 mm diameter)
- 80 cm probe cable
- Versatile attachment clip
- 2 x AAA micro batteries
Features & Benefits
- Adjustable Min./Max. Acoustic Alarm: Provides immediate audible alerts when temperatures deviate from set limits, ensuring critical conditions are addressed promptly.
- Long-Reach Penetration Probe: Features a robust 190 mm probe with an 80 cm cable, allowing for deep and flexible temperature measurement in diverse environments.
- Multiple Mounting Options: Comes with a practical clip for desktop propping, secure wall mounting, or easy attachment to gear, enhancing usability.
- Wide Measurement Range: Accurately measures temperatures from -50 °C to +150 °C, suitable for a vast array of HVAC, refrigeration, and industrial applications.
- Compact and Portable Design: With dimensions of 100 x 64 x 18 mm and a weight of 135 g, it’s highly convenient for both fixed installations and on-the-go inspections.
- Integrated Probe Storage: The probe and its cable can be neatly stowed directly on the thermometer unit, ensuring tidiness and preventing damage.
Applications
- Monitoring air temperatures in HVAC ducts and rooms
- Checking temperatures in refrigeration units and cold storage
- Measuring liquids in tanks or vats
- Spot-checking soft powdery substances
- Ensuring compliance with temperature regulations in various industrial settings
Tradie Pro Tip
Stop babysitting your readings! Use the 80 cm cable to drop the probe into a cooling vat, fridge, or HVAC duct while mounting the display unit safely outside. The instant acoustic alarm means you can walk away and work on other tasks, knowing it will alert you exactly when the target temp is hit.
Pair With
- Testo 550s Digital Manifold Kit: For comprehensive HVAC/R system analysis and commissioning.
- Insulation Materials: To maintain precise temperatures in monitored environments and improve energy efficiency.
- Air Velocity Meters: For measuring airflow alongside temperature in ducts and ventilation systems.
Keep Your Space Clean / Call to Action
Ensure precision and peace of mind in your temperature-critical operations. The Testo Mini Alarm Thermometer is your reliable partner for accurate monitoring and timely alerts. Invest in smart temperature control today and protect your assets and efficiency.
Technical Data
| Parameter | Specifications |
|---|---|
| Temperature Measurement | |
| Measuring range | -50 to +150 °C |
| Accuracy | ±1 °C (-30 to +150 °C) ±2 °C (Remaining Range) |
| Resolution | 0.1 °C (-19.9 to +150 °C) 1 °C (-50 to -20 °C) |
| General Technical Data | |
| Probe shaft dimensions | Length: 190 mm | Tip length: 8 mm Diameter: 3.5 mm | Tip diameter: 2 mm |
| Cable length | 80 cm |
| Dimensions (LxWxH) | 100 x 64 x 18 mm |
| Weight | 135 g |
| Product / housing material | ABS (Black) |
| Operating temperature | -10 to +50 °C |
| Storage temperature | -20 to +70 °C |
| Battery type & life | 2 AAA micro batteries | Approx. 500 h |
| Display type | LCD (Liquid Crystal Display), one-line |
Common Questions for Mini Alarm Thermometer 0900 0530
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