Protimeter Hygromaster L Thermohygrometer

  • Measures relative humidity and air temperature
  • Calculates dew point and specific humidity
  • Multiple applications in flood damage restoration and concrete flooring
More Info

Protimeter Hygromaster L Thermohygrometer

The Protimeter Hygromaster L Thermohygrometer is capable of measuring air temperature and relative humidity, which then allows it to calculate psychometric values such as dew point and specific humidity. This is ideal for assessing condensation conditions in buildings.

With a Quickstick sensor, the meter can measure humidity from 1% to 100% whilst with a Hygrostick sensor, the range goes from 30% to 98% with greater accuracy and is more suited to measuring conditions in concrete flooring slabs and high-humidity environments. Simply use the drop-down menu above to select your sensor. The air temperature range goes from 0˚C to 50˚C with both sensors.

The vibrant colour display on the Protimeter Hygromaster L clearly shows measured and calculated values – up to three can be shown simultaneously – as well as the intuitive menus that are used to operate the thermohygrometer. It has multiple applications in damage restoration, surveying, concrete moisture measurement and the HVAC sector.

The Protimeter Hygromaster L comes supplied with a humidity sensor, wrist strap and carry pouch. It is covered by a 24-month warranty.

Sensor Options

  • QuikStick humidity sensor (POL8751) - Recommended for general measurement and applications, such as flood damage restoration. Operates between 0-100% RH.
  • HygroStick humidity sensor (BLD4750) - Recommended for high %RH harsh environment applications, such as ERH measurement in concrete. Operates between 30 and 98% RH


The HygroMaster L thrives in a number of settings and environments:

  • Flood damage restoration
  • Building survey
  • Concrete and concrete flood measurement (ASTM-F2170 Standard)
  • HVAC test and measurement

Protimeter part number: BLD7750L / BLD7751L

Protimeter moisture meters by applications and functions

  Protimeter Aquant Protimeter BLE Protimeter Digital Mini Protimeter Hygromaster 2 Protimeter Hygromaster L Protimeter Mini Protimeter Mini C Protimeter MMS3 Protimeter ReachMaster Pro Protimeter Surveymaster2 Protimeter Timbermaster Protimeter MMS3 Flooring Kit
Find your Meter by application
Building Construction  
Building Survey  
Concrete floors          
Flood damage restoration    
Home Inspection      
HVAC Commissioning                
HVAC Commissioning                
Industrial Coatings                    
Marine Surveys                  
Wood Floors        
Wood Working                
Find your Meter by function
Pin moisture measurement          
Non-evasive Moisture Measurement                
Non-contact Temperature Measurement                    
Plug in Temperature Probe                  
Ambient Humidity                
Ambient Temperature                
Psychorometric Humidity Readings                  
Data Logging                  
WME Accessory Port            

Key Features

  • Air temperature range: 0˚C to 50˚C
  • Humidity range: 30% to 98% (Hygrostick) / 1% to 100% (Quickstick)
  • Calculation of dew point and specific humidity
  • Suitable for concrete flooring, surveys, flood restoration and HVAC sectors
  • Vibrant colour display with intuitive menus
  • 24-month warranty
  • Gross Weight: 8 oz (277 gms)
  • Dimensions (LxWxH): 7 in x 3.2 in x 1.5 in (178 mm x 81 mm x 38 mm)
  • Display: 2” TFT display, 176 x 220, 256K
  • Batteries (Included): 9V Alkaline

HygroStick Data (Nominal)

  • %RH Ranges: 30% to 40% RH (±3% RH) at 68ºF (20ºC); 41% to 98% RH (±2%) at 68ºF (20ºC)
  • Temperature Range: 32°F to 122°F (0°C to 50°C) ±0.6°F (±0.3°C)

QuikStick and QuikStick ST Data (Nominal)

  • %RH Ranges: 0% to 10% RH, ±3% RH at 68°F (20°C); 10% to 90% RH, ±2% RH at 68°F (20°C); 90% to 100% RH, ±3% RH at 68°F (20°C)
  • Temperature Range: 32°F to 122°F (0°C to 50°C) ±0.6°F (±0.3°C)

Nominal Response:

  • 30% to 90% and back to 30% RH in 45 seconds @ 68°F (20°C)


  • 24 months on mechanical or manufacturing defects.
  • Does not include wearing of parts or accessories.