Vaisala MI70 Handheld Measurement Indicator


  • Wide selection of measurement probes – HM70, DM70, MM70, GM70
  • Multi-probe operation – combine any two probes
  • Can be connected to selected fixed transmitters
  • Intuitive interface
  • Nine language options
  • Suitable for field checking of fixed instruments

Dpstar is a leading supplier of environmental measurement sensors for temperature, relative humidity, pressure, dew point, CO2, and other environmental condition monitoring for industrial process application and research. Since the ’90s, we earned a reputation as a trusted partner to our clients through our commitment and dedication. We are an authorized distributor and supplier of measuring sensors solutions from renowned manufacturers Vaisala. Vaisala is a global leader in environmental and industrial measurement. Building on 80 years of experience, Vaisala provides observations for a better world. Vaisala is a reliable partner for customers around the world, offering a comprehensive range of innovative observation and measurement products and services.

Vaisala MI70 is an easy-to-use measurement indicator. It’s perfect for on-site checks and calibrations of fixed instruments when paired with a measurement probe. The MI70 comes with probes for measuring humidity and temperature, dew point, moisture in oil, and CO2 levels. It can also serve as a display when connected to specific Vaisala transmitters.


Multi-Probe Operation

Users can select and display up to three measurement parameters at the same time. The graphic display shows the stabilization of measurement and process trends. The MI70 indicator has two cable ports by which a combination of any two probes (or transmitters) can be connected to it simultaneously. For example, a humidity and temperature probe could be connected to one port and a CO2 probe to the other. The indicator can display the measurements made by both probes, so humidity, temperature, and CO2 data could be displayed simultaneously.

Intuitive User Interface

Vaisala MI70 features a multilingual, menu-based user interface and a clear graphical LCD display. All in all three measurement parameters can be displayed and simultaneously logged in the memory. The display shows measurement trends graphically and numerically. Users can select the measurement parameters and units. Vaisala MI70’s intuitive user interface operates with menus and keypads to change settings, logging, and display preferences.

Multiple Language Options

There are nine language options in Vaisala MI70: Chinese, English, Finnish, French, German, Japanese, Russian, Spanish, and Swedish.

Optional Connection to PC

The optional Vaisala MI70 Link Windows software and the USB connection cable form a practical tool for transferring logged data as well as real-time measurement data from Vaisala MI70 to a PC


MI70 Measurement Indicator
Operating Environment Operating temperature -10 … +40 °C (+14 … +104 °F)
Operating humidity 0 … 100 % RH, non-condensing
Storage temperature -40 … +70 °C (-40 … +158 °F)
Inputs and Outputs Max. no of probes 2
Power supply Rechargeable NiMH battery pack with AC adapter or 4xAA size alkalines, type IEC LR6
PC interface MI70 Link software with USB or serial
port cable
Analog Output Scale 0…1 VDC
Output resolution 0.6 mV
Accuracy 0.2 % full scale
Temperature dependence 0.002 %/˚C full scale
Minimum load resistor 10 kΩ to ground
Mechanical Specifications Housing classification IP54
Housing materials ABS/PC blend
Weight 400 g
Compatibility EMC compliance EN61326-1, Portable Equipment
Other Menu languages English, Chinese, Spanish, Russian,
French, Japanese, German, Swedish,
Display • LCD with backlight
• Graphic trend display of any parameter
• Character height up to 16 mm
Alarm Audible alarm function
Data logging capacity 2700 real time data points
Logging interval 1 s to 12 h
Logging duration 1 min … memory full
Resolution 0.01 %RH, 0.01 °C/°F, 0.01 hPa,
0.01 aw, 10 ppm / 0.01 %CO2
Battery Operation Time
Typical charging time 4 hours
Operation Times Continuous use (one probe of HM70, DM70 and MM70 series) 48 h typical at +20 ˚C (68 °F)
Continuous use (GM70 handle) better than 8 h at +20 °C (+68 °F)
Continuous use (GM70 pump) better than 5 h at +20 °C (+68 °F)
Data logging use up to a month, depending on logging
Measurement Probes for the MI70
HM70 Series Humidity and Temperature Probes HMP75(B) General purpose probe
HMP76(B) Long, stainless steel probe
HMP77(B) Small probe, with 5 m cable
DM70 Series Dewpoint Probes DMP74A, DMP74B Pressure tight probes for dry air measurements
DMP74C Probe for SF6 gas measurements
Probe for SF6 gas measurements MMP78 Pressure tight, stainless steel probe
GM70 Carbon Dioxide Probes GMH70 Handle for probe for di‡ffusion sampling
GM70PUMP Sampling pump for GM70
Spare Parts & Accessories
Carrying Cases A weatherproof carrying case for HM70, DM70 and GM70 short probes MI70CASE3
A weatherproof carrying case for HM70 and MM70 long probes MI70CASE4
A soft carrying case for HM70, DM70 and GM70 short probes MI70SOFTCASE
Transmitter Connection Cables MMT/HMT330, HMT120/130, DMT340, PTB330, PTU300 Series 211339
HMD60/70 Series HMA6070
DMT242 27160ZZ
DMT143, DMT143L, DMT152, MMT162
HMW90 Series, HMDW110 Series and GMW90 Series
MMT/HMT310 Series, GMP343 DRW216050SP
GMT220, GMD20 GMA70
HMP155 221801
Software MI70 Link software with USB cable 219687
MI70 Link software with serial port cable MI70LINK
Other Analog output cable 27168ZZ
10 m (32.81 ft) extension cable for probe 213107SP
Battery, NiMH 4.8 V 26755


Vaisala MI70 Handheld Measurement Indicator_DpstarGroup