Sonel MRU-21 earth resistance meter

The Sonel MRU-21 is an earth resistance meter based on the 3-pole measurement system. The MRU-21 features automatic compensation for the used test leads. In addition, it is possible to adjust the maximum measuring voltage. This meter can be carried around the neck and features soft-touch buttons for easy use. A big multifunctional LCD display shows the results and explains the necessary user inputs. All functions are easy accessible and customizable with the soft-touch buttons through the built-in menu.

The MRU-21 can be connected to a PC with the supplied USB-cable. Measurement results can then be downloaded with the included Sonel Reader software. The internal memory of the meter can support up to 990 measurements.

Specifications

Measurement range of earthing resistance	0 - 1,99 kΩ
Measurement range of interference voltage UN (RMS)	0 - 100V
Measurement range of resistance of auxiliary electrodes RH & RS	0 - 50.0 kΩ
Measurement range of continuity of equipotential bondings and protective conductors	0.13 - 199 kΩ
IP Rating	IP54
Internal Memory	up to 990 measurements
Connectivity	USB
Safety Category	CAT IV 300V
Number of measurements on 1 battery charge	> 1000
Dimensions	288 x 223 x 75 mm
Weight	1.4 kg

Accessories

The Sonel MRU-21 comes in a professional kit, which includes:

• USB cable
• 30m red test lead on reel
• 15m blue test lead on reel
• 1.2m blue test lead with banana plug
• 2.2m black test lead with banana plug
• Black & blue crocodile clips
• 2 x 30cm earth probes
• Carrying case
• Hanging straps
• Batteries (4xLR14)
• Sonel reader software
• Calibration certificate