[![hygrometry_temperature_probe_manifold](/sites/default/files/styles/product_image/public/images/IMA_28145_Si-TH4_Front_web_1.png?itok=qS9mNQat)](https://www.kimo-instruments.com/sites/default/files/styles/max_1300x1300/public/images/IMA_28145_Si-TH4_Front_web_1.png?itok=7nXnILhk)

[![hygrometry_temperature_probe_manifold](/sites/default/files/styles/thumbnail/public/images/IMA_28145_Si-TH4_Right_web.png?itok=PijeAw7U)](https://www.kimo-instruments.com/sites/default/files/styles/max_1300x1300/public/images/IMA_28145_Si-TH4_Right_web.png?itok=lkfr7N9q)

[![hygrometry_temperature_probe_manifold](/sites/default/files/styles/thumbnail/public/images/IMA_28145_Si-TH4_Profile_web.png?itok=eSq3s-mx)](https://www.kimo-instruments.com/sites/default/files/styles/max_1300x1300/public/images/IMA_28145_Si-TH4_Profile_web.png?itok=oDEZ7AnI)

 

 

 

 Ref: Si-TH4

  

 

This wireless psychrometric probe provides accurate indoor and outdoor temperature and hygrometry measurements to work on air  
conditioning, refrigeration and heat pump installations.  
  
The Si-TH4 calculates dry and wet bulb temperatures quickly and easily, using a flexible probe with a sliding magnet for convenient  
positioning. It connects easily to the [Si-RM350](https://sauermanngroup.com/en-US/node/39571) and [Si-RM450](https://sauermanngroup.com/en-US/node/39574) manifolds, as well as to the [mobile application Sauermann Pilot](https://sauermanngroup.com/en-US/node/39599).

##### A1 / A2L / A2 / A3 refrigerants compatible  
Compatible with some B1 refrigerants, see list of refrigerants for details on which refrigerants are compatible. The device must not be used with ammoniac refrigerant (NH3 / R717).



 [  Technical Data sheet ](https://www.kimo-instruments.com/sites/default/files/files/DS_Si-RT2_Si-RT5_Si-RT7_Si-TH4_EN_26-11-24.pdf) [  Simplified manual ](https://www.kimo-instruments.com/sites/default/files/files/QSG_RP4-RV4-Si-RT2-Si-RT5-Si-RT7-Si-TH4_22-09-25_4.pdf) 

 

       Fast and accurate Dry Bulb and Wet Bulb temperatures 

 

       Outdoor, indoor and in-ducts measurements 

 

       Flexible probe with sliding magnet for easy positioning 

 

       Quick & Strong wireless auto connection (100 m/328 ft range) 

 

       Real time readings on manifold and mobile app 

 

 

 

 


 Product info   #### Measure details

- Units
    
     
    
    °F, °C, % RH
 
 ![shadow](/themes/custom/kimo/images/divider-big.png) 

 

#### Measuring ranges

- Temperature
    
     
    
    -20.00 °C ... 60.00 °C
- Temperature
    
     
    
    -4.00 °F ... 140.00 °F
- Humidity
    
     
    
    0.00 % RH ... 100.00 % RH
 
 ![shadow](/themes/custom/kimo/images/divider-big.png) 

 

 



 



 

 

#### Technical details

- Parameters
    
     
    
    Relative humidity
    
    Temperature
- Battery life
    
     
    
    50 hours
- Standards
    
     
    
    2011/65/EU RoHS II
    
    2012/19/EU WEEE
    
    2014/53/UE RED
- Wireless connection
    
     
    
    Yes
- Power supply
    
     
    
    3x LR03 AAA 1.5 V alkaline batteries
 
 ![shadow](/themes/custom/kimo/images/divider-big.png) 

 

#### Instrument Dimensions

- Length 
    
     
    
     Width 
    
     
    
     Height 
    
     
    
     Weight
- 16 3/32 inches 
    
     
    
     1 1/2 inches 
    
     
    
     1 13/32 inches
 
 ![shadow](/themes/custom/kimo/images/divider-big.png) 

 

#### Storage temperature

- Min 
    
     
    
     Max
- -20.00 °C 
    
     
    
     50.00 °C
- -4.00 °F 
    
     
    
     122.00 °F
 
 ![shadow](/themes/custom/kimo/images/divider-big.png) 

 



 Supplied with   3 AAA batteries

 

 

 Downloads   #### Documents

[    Manifolds](/sites/default/files/files/DOC_EN-US_Manifold-2025_V1-20250520_Web.pdf)

 





 Software   [ ![Sauermann_pilot_mobile_app_ios_android](/sites/default/files/styles/small/public/images/IMA_MOBILE-APP_%20iPhone%2015_web_0.png.webp?itok=FScfWI2D)

 Sauermann Pilot](/en-US/measuring-instruments/digital-refrigeration-gauges/software/sauermann-pilot)

 

 

 Videos   [![](/sites/default/files/styles/video_ct_thumbnail/public/video_thumbnails/tZYCSUP6pLU.jpg.webp?itok=MHv6RAZn)](/en-US/videos/si-rm350-si-rm450-manifolds-range)

       

##  [Si-RM350 & Si-RM450 Manifolds Range](/en-US/videos/si-rm350-si-rm450-manifolds-range) 

 



 

 

 Compliance