MM70 Hand-Held Moisture Meter for Transformer Oil - Vaisala Online Store

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MM70 Hand-Held Moisture Meter for Transformer Oil

The MM70 enables reliable detection of moisture in mineral-based transformer oil. It primarily measures the moisture of the oil as water activity (aw), but in this version the reading is converted into a ppm output calibrated for mineral-based transformer oils. The probe can be inserted (and removed) directly into the transformer oil through the supplied ball valve without draining the system.

The MM70 also supports the use of Vaisala's humidity, dew point, and carbon dioxide probes, making it a versatile investment applicable to several multi-parameter applications. Two probes can simultaneously be connected to the MM70.

The MI70 Link Windows® software and the USB connection cable form a practical way for transferring logged and real time measurement data from the MM70 to a PC.

The package includes:

  • MI70 hand-held indicator
  • MMP78 moisture in oil probe
  • Manual press tool for installation
  • Calibration certificate (ISO9001 compliant, traceable to NIST)
  • Ball valve set with welding joint, fitting body and blanking plug
  • Rechargeable battery pack and universal AC adapter
  • USB cable
  • Professional carrying case
  • User's Guide in English

The MI70 Link Windows® software is downloadable from our web site: Download MI70 Link Windows® software.

MM70 Hand-Held Moisture Meter for Transformer Oil
MM70 Hand-Held Moisture Meter for Transformer Oil
Standard delivery time for single unit: 1 week
About delivery times »
Warranty: 24 months
About warranty »

Part no. MM70F1A1A5A1B0A2B0

Quantity Price
2935 € + VAT

Detailed information

Measurement parameter(s)Moisture (ppm)
Measurement range0 ... 1 aw
-40 ... +100 °C (-40 ... +212 °F) T
Measurement accuracy±0.02 (0 ... 0.9 aw)
±0.03 (0.9 ... 1.0 aw)
±0.2 °C (±0.36 °F) T
Operating temperature-40 ... +60 °C (-40 ... +140 °F)
Operating pressure0 ... 20 bar (0 ... 290 psi)
Operating voltageRechargeable NiMH battery pack and universal AC adapter
Analog outputs0 ... 1 V
Housing classificationIP65 (NEMA 4) for probe
IP54 for MI70 indicator
Links See full specifications on
Download user guides and other product documents on

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