STARTING AT $10.50 PER MONTH: 1, 3, 5 year license options
 
The EM21 Wireless Environmental Monitor is a wireless, waterproof, data-logging sensor that monitors temperature and humidity. The EM21 is ideal for ensuring food safety during transportation, monitoring warehouse conditions, and other applications that rely on environmental data to ensure quality and maintain compliance. The EM21 is a part of a complete solution designed to enhance efficiency, safety, customer service, and compliance. 
 
Wirelessly monitors temperature and humidity
Durable waterproof design with LCD display
Class-leading electronics with multi-year battery life with single AA battery
Scales from small operations to thousands of assets
Easy plug-and-play installation takes 15 minutes
 
Product Specifications
Dimensions: 6.3 x 6.3 x 2.25 cm (2.48 x 2.48 x .89 in)
Weight: 75.6 g
Operating Temperature: -40° to 60°C
Battery: 3+ year battery life, user-replaceable AA battery
Probe (EM22): Stainless steel (5.0 x .33 cm), 28AWG hermetically-sealed PFA jacket (sterilizable). Total probe and wire length = 120 cm
Ingress Protection: IP67 rated waterproof and dustproof per IEC standard 60529; designed for splash, spray, and dust (body no intended for prolonged submersion)
Data Logging Capacity: When vehicle is on, typical power draw is 1W (3 months)
Data Upload: Automatic (zero touch) wireless data upload via Samsara gateway
Included Sensors:
Temperature (Built-In): 
Range: -40° to 60° C (limited by operating range)
Accuracy: -10° to 60° C, Typical: ±0.3°, C Max: ±0.4° C -40° to -10° C, Typical: ±0.7°, C Max: ±0.9° C
Temperature (External Probe - EM22):
Range: -55° to 100° C
Accuracy: -55° to 100° C Typical: ±1.0° C
Time Constant: 5.0s (oil bath)
Humidity
Range: 0-95% RH
Accuracy: 0 to 80% RH Typical: ±2.0% Max: ±3.0% 80 to 90% RH Typical: ±2.5% Max: ±3.8% 90 to 95% RH Typical: ±3.0% Max: ±4.5%
Time Constant: 18s (1 m/s airflow)
Real-Time: Samples every 4 seconds, transmits new data to the cloud in real-time
Auto-Discovery: Automatically detects and connects to any sensor associated with same account
Wireless Range: 100 ft / 30 m (line of site). Actual range depends on RF interference, building materials, and physical obstacles
Radio Frequency: 2.4 Ghz, proprietary low-power sensor data protocol
Visibility and Management: Real-time visibility, SMS and email alerts, and historical reports via Samsara Cloud dashboard for web and mobile devices
All-Inclusive License: Requires EM license, which includes maintenance and support, dashboard access, sensor data storage, and feature updates