Fluke 28 II Rugged IP67 True-RMS Digital Multimeter

28 II rugged true-RMS multimeter with thermometer explained

The Fluke 28 II Rugged True-RMS Digital Multimeter (28 II) is the top model of the Fluke 20 series. It is IP 67 rated, MSHA approved and drop-tested from 3 m, and adds true-RMS AC, a built-in thermometer, a low-pass filter for drives and a 20,000-count high-resolution mode. Seven Star LLC supplies 28 II in Oman and the GCC as an independent supplier in Muscat, not affiliated with the manufacturer.

The 28 II extends the 27 II with several measurement functions; the table decodes the headline figures.

28 II technical specifications

Values come from the manufacturer product page for the Fluke 28 II.

How the Fluke 28 II Rugged True-RMS Digital Multimeter works

The 28 II is a sealed, drop-tested instrument with true-RMS measurement. A selectable low-pass filter attenuates the high-frequency switching content from variable speed drives so that the motor voltage reading is usable, and Peak Min/Max records transients as fast as 250 µs.

Its built-in thermometer reads K-type probes up to 1090 °C, and the high-resolution mode raises the display to 20,000 counts for finer readings. Relative mode removes test lead resistance from low-ohms work.

Key features

• True-RMS AC voltage and current
• Built-in thermometer, -200 °C to +1090 °C
• Low-pass filter for drive circuits
• High-resolution 20,000-count mode
• Backlit keypad and reversible holster

Where 28 II fits and related Fluke models

The 28 II is the more capable of the two rugged meters. If you need drive measurements, temperature or transient capture in a sealed meter, choose it over the 27 II. Equivalent non-rugged functions are in the 87V and 287.

Use the TL75 leads and AC175 clips supplied; optional magnetic hanger helps hands-free viewing.

Selection checklist for 28 II

Confirm the following points before ordering, so that the instrument matches the work and the safety rules of your site.

• Need for true-RMS and drive measurement.
• Temperature range requirement (up to 1090 °C with probe).
• Exposure to water, dust and drops.
• Accessory set: leads, clips and thermocouple are included.

Safe use, care and maintenance of 28 II

• Before each shift, inspect the case, the holster and the test leads. Cracked insulation, exposed metal or a loose input jack means the leads should be replaced before the 28 II touches any live circuit.
• Confirm the meter on a known live source before and after a measurement that decides whether a circuit is dead. Never rely on a single reading when the result will be used to release a lock-out.
• Keep the input fuses to the specified type only. A blown fuse in the current inputs is the most common service event on a multimeter used on motor circuits, and a wrong fuse defeats the safety design of the Fluke 28 II Rugged True-RMS Digital Multimeter.
• Replace the battery when the low-battery symbol appears, because readings near the lower end of the range become unreliable on a weak cell. Remove the battery before long storage.
• Store the instrument clean and dry. In coastal Oman, wipe off salt film and condensation after outdoor use and avoid leaving it in a vehicle cabin in summer.

Typical applications of 28 II in Oman and the GCC

Handheld multimeters are carried in every plant. In Oman, oil and gas facilities, power stations, desalination plants and petrochemical sites rely on them for control-panel faults, motor circuits, instrument loops and routine electrical checks.

The 28 II suits maintenance teams working outdoors and in wet areas: pump stations, desalination plants, offshore support yards and mines. Its drive filter and thermometer make it a practical single instrument for motor fault finding on Omani oil and gas and water sites.

28 II compared with nearby models

The 287 adds logging and graphing but is not IP 67 rated.

Information to send with an RFQ for 28 II

To prepare an accurate quotation, please send:

• Exact model 28 II and the quantity required.
• Whether the meter is for a lab, a workshop or field service, so the correct accessory set can be quoted.
• Required test lead type and any extra clips or probes.
• Temperature probe, case or magnetic hanger requirements.
• Whether calibration traceability paperwork is needed on delivery.
• Delivery point in Oman or elsewhere in the GCC and the required date.

Storage, handling and spares for the Fluke 28 II

Store the Fluke 28 II in its case or holster with the test leads disconnected. Remove the batteries if the meter will not be used for several weeks, because leaking cells can damage the battery contacts. In Oman and the GCC, do not leave the instrument in a parked vehicle during summer, where cabin temperature can go well above the storage limit in the user manual.

• Inspect test leads, probes and clamps before each use and replace any lead with damaged insulation or exposed metal.
• Use only leads and accessories rated for the same or a higher measurement category than the work you do.
• Keep spare fuses of the exact type given in the manual; a wrong fuse removes the protection the meter is built with.
• Plan a regular calibration interval, often twelve months, and keep the certificate with the instrument records.

If your team uses several units of the Fluke 28 II, it is useful to order spare test leads and batteries in the same RFQ, so that a meter is not taken out of service for a simple accessory.

Documents and quotation

Send the part number 28 II and we will confirm which manufacturer documents are available for this model.

For a quotation, send the part number 28 II, the quantity and your delivery location in Oman or the GCC through the RFQ button on this page. Availability and lead time are confirmed per request.