Ethernet thermometer & hygrometer with GSM module and battery

TH-341GB is an extended version of our popular device TH-332A with integrated 2G GSM/GPRS module, 2200 mAh li-ion battery and one SPDT relay output. Besides the standard capabilities of all hygrometers, this device can detect internet and ethernet up/down events and also mains power failure. Each of these events can trigger SMS messages, email messages, Android push notifications, SNMP traps, Zabbix messages or activate the relay output. According to the current conditions, the device will automatically select the ethernet or the GSM module when sending that messages. The onboard battery allows normal device operation within 7 - 8 hours if no other power is available, and will be automatically recharged when the primary power is back on.

no maintenance needed

Fast and easy installation

All you need to install and run our devices is your 2 hands and 10 seconds time. Just plug in the ethernet cable and the power jack and you're ready to start. So easy as that!

No unnecessary software

Platform independent

You're using a desktop PC, laptop, tablet or smartphone with Windows, Linux, iOS or Android. That doesn't matter! All you need is just a modern WEB browser and an internet connection.

local data logging

Graphical data representation

Many products from other companies require additional software installation that allows data logging and visualisation. Our products doesn't need this - they have all what's needed onboard!

Modern hardware

Performance and reliability

All of our products are designed and manufactured on the basis of modern and advanced electronic components from leading manufacturers in this field - Microchip, Atmel, Maxim Integrated, On Semiconductor, Texas instruments and others.

Accuracy is important

Precise digital sensor

All of our thermometers and hygrometers are equipped with precisely calibrated high-quality digital sensors from leading manufacturers that guarantee the accuracy of each measurement!

Network connectivity

Access from around the world

No matter if you're at home, at the office or on vacation, your devices are on just one click distance. All you need is a PC, smartphone or tablet with an internet connection. Nothing else!


Comparison table
  • 10/100Base-T ethernet interface
  • high-quality, precisely calibrated digital sensor (certificate)
  • dust-proof sensor with 1m cable length and 4mm mounting hole
  • measures temperature from -40°C to +120°C
  • measurement resolution 0.1°C, ±0.3°C accuracy
  • measures relative humidity from 0 to 100%
  • measurement resolution 0.1%, ±2% accuracy
  • nonlinearity < 0.1%
  • dew point calculation
  • time-differential measurement of the temperature and the relative humidity (value change per given interval)
  • integrated quad-band 2G/GPRS GSM module with internal micro SIM card slot
  • integrated 2200 mAh lithium-ion battery with automatic recharge, allowing 7-8 hours of operation
  • auto shutdown when the battery voltage drops below the required minimum
  • 4 LEDs for indication of various conditions and working modes
  • 1 SPDT relay output 1А/250V for additional signaling
  • graphical representation of the maasured values  (demo)
  • email 1, SNMP traps, Android push notifications and Zabbix messages on out-of-range events
  • 3 different notification ranges - Alert, Warning & Critical
  • supports TCP/IP, ICMP, ARP, UDP, DNS, SSL, NTP, HTTP, SMTP, SNMP and DHCP network protocols
  • integrated WEB server
  • integrated SNMP v2c server + traps
  • integrated TCP server for remote data logging
  • integrated Modbus/TCP Slave for industrial & building automation systems
  • integrated MySQL client for custom data logging
  • integrated HTTP client for custom web server logging
  • supports data acquisition from the WEB server in XML and JSON format
  • free push notifications for Android smartphones and tablets
  • volatile data history for the last 24 hours and the last 7 days
  • data logging and visualisation for ~260.000 records in internal non-volatile memory (demo)
  • determining the availability of Internet connection via ping to a predefined host
  • determining the presence or absence of power supply
  • determining the presence or absence of active ethernet connection
  • configurable conditions for entering offline mode 2
  • supports firmware upgrade from the WEB server
  • included 5V 2A power adapter
  • password protected configuration
  • easy configuration
  • compact size (130 x 100 x 30 mm)
  • 3 years warranty
  • 1 supports up to 2048-Bit TLS_RSA_WITH_AES_256_CBC_SHA encryption
  • 2 the offline mode determines when to use the GSM module instead of the LAN interface


  • industrial & building automation systems
  • HVAC & refrigeration systems
  • remote data logging and monitoring
  • server rooms and racks monitoring
  • individual client/server applications
  • weather condition monitoring systems
  • fire, alarm and control systems
  • agriculture and livestock breeding
  • chemical industry
  • pharmaceutical industry
  • food industry
  • logistics and warehouses
  • as well as many others...

Order now

1 - 10 300 00
11 + 282 00
  All prices include 20% VAT.

Sensor tolerance (SHT21)