Industrial TRMS Multimeter with Datalogging (Wireless)


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The FLIR DM91 offers comprehensive features and durable design for quick and safe troubleshooting of electrical, electronic, and HVAC/R systems. Equipped with LoZ, VFD Mode, µA current measurement capability and more, the DM91 provides trusted results for the most accurate diagnosis of problems. The DM91 is enhanced with Bluetooth® technology to wirelessly connect via METERLiNK® to FLIR infrared cameras, or to mobile devices running the FLIR Tools™ app.

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  • Trusted, Accurate Readings

    Diagnose complex systems with True RMS, LoZ, VFD, and more. Assess temperatures up to 400°C (752°F) with the Type-K thermocouple.

  • Work Longer without Interruption

    DM91 offers powerful LED worklights and flexible battery options; datalogging and storage allows you to document intermittent trends.

  • Streamline Reporting and Sharing

    Bluetooth METERLiNK® allows you to wirelessly share readings with clients or embed data into FLIR thermal camera images.

Maximum Voltage
1000 V DC or 1000 V AC RMS
Packaging Size
32 cm x 14 cm x 11 cm (12.6 in. x 5.5 in. x 4.3 in.)
Limited lifetime warranty
Accessories In the Box
TA82 Premium Silicone Test Leads, TA84 Test Lead Storage/Tripod Accessory, TA70 CAT IV Insulated Alligator Probes (Slip On), TA60 Thermocouple Adapter with Type K Probe
Accessories Optional
TA72 Universal Flex Current Probe Accessory 25cm (10"), TA74 Universal Flex Current Probe Accessory 45cm (18"), TA04-KIT Lithium Polymer Rechargeable Battery Kit, TA15 Soft Sided Carrying Case, TA52 Magnet Mount, TA50 Magnetic Hanging Strap, TA42 Belt Clip, TA10 Protective Case for FLIR DMMs, TA10-F Protective Case for FLIR DMMs and TA7X
Connections & Communications
Drop test
IP Rating
Imaging & Optical
Display Counts
Measurement & Analysis
Range: 10.00mF Basic Accuracy:1.9%
Category Rating
CAT IV—600 V, CAT III—1000 V
Contact Temperature Type K thermocouple
–40 to 400°C DMM ± (1.0% + 3°C)/ IGM ± (1.0% + 5°C)
Continuity check
Range: 600.0 Ω Basic Accuracy: ±0.9%
Diode Test
1.500 ± (0.9% + 2D)
Frequency Counter
Range: 100.00 Hz Basic Accuracy: ±0.1%
Range: 6.000 MΩ Basic Accuracy: ±0.9%
Measuring Rate
3 samples per second
Battery Life
Alkaline ~110hrs, LithiumPolymer (Optional)~ 500hrs
Battery Type
3x AA
System Interface
Data Storage
with Recall, 1 file of 40k readings
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Export Restrictions

Export Restrictions

The information contained in this page pertains to a dual use product controlled for export by the Export Administration Regulations (EAR). Diversion contrary to US law is prohibited. US Department of Commerce authorization is not required prior to export or transfer to foreign persons or parties unless otherwise prohibited.