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  • Wireless Digital Temperature Sensor
Wireless Digital Temperature Sensor

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Product Variations


The ALTA Digital Temperature Sensor assesses the temperature of whatever environment the probe is in. At the push of a button, temperature readings are displayed on the device's digital display and sent to iMonnit software through a Monnit gateway(purchased separately), creating an easy-to-read log of current and past readings.

Explore ALTA Standout Features

  * Actual range may vary depending on environment.
** Battery life is determined by sensor reporting frequency and other variables.

Data Snapshot

Temperature sensor data view in software

In the Box

  • Wireless Sensor
  • Mounting Hardware
  • 2 x AA Batteries

Thermistor Specifications

Power Supply 2.0-3.8 VDC (AA alkaline or lithium batteries)
Current Consumption 0.2 µA (sleep mode), 0.7 µA (RTC sleep), 570 µA (MCU idle), 2.5 mA (MCU active), 5.5 mA (radio RX mode), 22.6 mA (radio TX mode)
Optimal Battery Operating Temperature 0°F to 130°F (-18°C to 55°C) using alkaline -40°F to 185°F (-40°C to 85°C) using lithium
Operating Temperature +50°F to +122°F (+10°C to +50°C)
Device Memory Up to 3200 sensor messages
Security Encrypt-RF® (256-bit key exchange and AES-128 CTR)
Measuring Range -40°F to +257°F (-40°C to +125°C)
Accuracy +/- 1.8° F (1° C)
User Calibrated Accuracy +/- 0.45° F (± 0.25° C)
Resolution 0.1° F (0.1° C)
Response Time 15 sec max
Lead Wire Length Lead Length: 3 ft or 10 ft (Contact Monnit for custom length options)
Storage Temperature: -4°F to 158°F (-20°C to 70°C)
Visual Confirmation 14.0 mm x 26.0 mm

Variation Specifications

Weight 3.08 oz. (87.32 g) - with 3 ft. (0.91 m) lead

ALTA AA Specifications

Battery Type 2 Replaceable AA 1.5 V Batteries
Dimension 4.375 in x 2.470 in x 1.12 in
Supply Voltage 2.0 - 3.8 V (2 x AA 1.5V Batteries or Optional Power Supply)
Battery Life At 1 hour heartbeat setting, AA batteries will last up to 10 years.**
Max Operating Temperature Using AA Alkaline -18°C to 55°C (0°F to 130°F)
Max Operating Temperature Using AA Lithium -40°C to 60°C (-40°F to 140°F)
Optimal Battery Operating Temperature +10°C to +50°C (+50°F to +122°F)
Enclosure Material ABS

ALTA 900 MHz Specifications

Operating Frequency 900 MHz Operating Frequency
Certifications Complies with Part 15 of the FCC Rules. (FCC ID: ZTL-G2SC1)
Complies with Industry Canada standards. (IC: 9794A-G2SC1)
Device Range Device Range Up to 1,200 ft. non-line-of-sight, wireless device range*
Security Encrypt-RF® (Diffie-Hellman Key Exchange + AES-128 CBC)
Specifications Image

Suggested Application Uses for This Sensor

  • Freezer and cooler temperature monitoring to detect failure and prevent food spoilage
  • Server room temperature monitoring
  • Cadaver storage cooler temperature monitoring
  • Greenhouse temperature monitoring
  • Warehouse temperature monitoring to avoid frozen fire suppression systems
  • Monitor vacant commercial property temperatures to avoid frozen pipes
  • Summer/winter (vacation) property monitoring for frozen pipes or excessive heat
  • HVAC system monitoring to detect failures or heating / cooling issues
  • Monitor temperature of K9 units
  • Art gallery temperature monitoring