Loresta-GX II resistivity meter

Measuring range

The device enables high-precision measurements in the low-resistance range, in particular of the specific surface resistance (Ω/□), the specific volume resistance (Ω·cm) and the specific electrical resistivity (S/cm).

4 point measurement method

The Loresta-GX II works according to the 4 point measurement method, which is based on the four-wire process. This method was developed to eliminate the influence of contact resistance. The first circuit includes a constant current source that is passed through the contact resistances and the desired resistance Rx. The second circuit contains a voltage measuring device with a high internal resistance, so that no current enters this circuit. This means that the voltage across the resistor Rx is measured without the influence of contact resistances (r1, r2).

4-pin measuring heads

The Loresta series has 4-pin measuring heads that eliminate cable, connector and contact resistance. This enables much more precise resistance measurements. To simplify the measurement method and calculation of the correction factors, all four electrodes are at an equidistant distance from each other. The electrodes are usually arranged collinearly, but other arrangements, such as square, are also permitted. The outer electrodes carry an impressed direct current, while the inner electrodes pick up the voltage on the surface of the sample. This allows the electrical resistance to be determined.

Software: automatic correction factor

The measuring device software calculates the specific Volume resistance and Surface resistance through the use of one correction factor and the thickness of the sample. The software derives this factor by entering the measurement object data, shape (rectangle or disc), dimensions, and measurement position.

Additional features of the Loresta-GX II

• 7.5“ TFT LC touch display: Colored display for easy data reading and menu navigation.
• USB interface: Allows data transfer to a PC.
• Automatic measurement modes: Auto-hold and timer mode for convenient one-touch operation.
• Selective voltage selection: Allows measurements of materials with low resistivity.
• Special mode for silicon wafers: Special measurements for silicon wafers.

Comparison of the measuring devices Loresta GX and Loresta FX

The Conductivity meters Loresta-GX II and Loresta-FX from NH Instruments have been developed for different applications in Research and Development, Production engineering as the Quality Control Both systems enable precise measurements in the low-impedance range, but differ in function, features, and application.

Loresta-GX II – Highest precision for stationary applications

The Loresta GX II is a powerful benchtop instrument for high-precision measurements of surface and volume resistivity, as well as electrical resistivity. It was specifically designed for use in stationary laboratory environments where highest accuracy, Reproducibility and Process safety are required.

Equipped with a large, intuitive touchscreen, the device offers numerous functions such as Self-Hold, a Timer mode as well as a special one Silicone mode for sensitive materials. The automatic calculation of the correction factor Not only simplifies operation, but also minimizes potential sources of error during evaluation. Its stable power supply and versatile connection options make the Loresta-GX II the optimal choice for demanding measurement tasks that require documentation.

Loresta-FX – mobility and efficiency for flexible use

The Loresta FX however, is compact, mobile measuring device designed for use directly on the production line or in the field. It impresses with its low weight, easy operation and the optional battery, making it ideal for flexible use in quality control and process monitoring suitable.

The correction factor for the FX model manually set, which is perfectly sufficient for many practical applications. Its ease of use makes the device ideal for quick on-site measurements without sacrificing reliability.

While that Loresta GX II with its precise measuring technology and automated functions, especially in the laboratory environment, the Loresta FX ideal for mobile, time-efficient testing tasks in production. Both devices complement each other perfectly and offer engineers, quality managers, and technicians maximum flexibility for diverse requirements in the field of electrical resistance measurement.

The Loresta-GX II resistivity meter is an indispensable precision instrument for professional use in research and development, production engineering, and quality control. It was specifically designed for measurements on conductors and semiconductors in the low-resistance range and supports users in the development of innovative materials, the optimization of industrial manufacturing processes, and compliance with quality standards.

In addition, the Loresta-GX II is suitable for measurements based on the ASTM D 991, ISO 2878, ISO 1853, JIS K 7194, and JIS R 1637 standards.

Item number	Loresta-GX MCP-T700
Measurement method	4-point measurement method, constant current method
Measuring range	10-4 - 107 Ω x cm
Measurement mode	Auto function: Auto-Hold / Timer Mode – Special Silicone Mode
Display	7.5″ TFT LC touch display, 640 x 480 pixels
Power supply	AC 85-264V / 47-63Hz / 40VA
Interface for data output	USB
Sold in sheets:	320mm x 285mm x 110mm (W x D x H)
Weight	2,4 kg
Delivery	ASP measuring head RMH110 Measuring head tester RMH304 (1.0Ω) Manual
EC Declaration	Devices including EC Declaration of Conformity (CE Marking) / UK Declaration of Conformity (DoC): All our equipment meets applicable European and British standards for safety and quality.
conformity standards	EN 61000-6-3:2007, EN 61000-6-1:2019, EN 61010-1:2010/A1:2019, EN IEC 63000:2018
warranty	Our devices are covered by a 12-month warranty.

Measuring range & measuring accuracy

	Power Supply
Range	1A	100mA	10mA	1mA	100	10	1	0.1
10-4	±(2.0% + 30dgt)
10-3	±(2.0% + 20dgt)	±(2.0% + 20dgt)
10-2	±(1.0% + 5dgt)	±(1.0% + 5dgt)	±(2.0% + 20dgt)
10-1	±(1.0% + 3dgt)	±(1.0% + 3dgt)	±(1.0% + 5dgt)	±(2.0% + 20dgt)
100		±(0.5% + 3dgt)	±(0.5% + 3dgt)	±(1.0% + 5dgt)	±(2.0% + 20dgt)
101			±(0.5% + 3dgt)	±(0.5% + 3dgt)	±(1.0% + 5dgt)	±(2.0% + 20dgt)
102				±(0.5% + 3dgt)	±(0.5% + 3dgt)	±(1.0% + 5dgt)	±(2.0% + 20dgt)
103					±(0.5% + 3dgt)	±(0.5% + 3dgt)	±(1.0% + 5dgt)	±(2.0% + 20dgt)
104						±(0.5% + 3dgt)	±(0.5% + 3dgt)	±(1.0% + 5dgt)
105							±(0.5% + 3dgt)	±(1.0% + 3dgt)
106								±(1.0% + 3dgt)
107								±(2.0% + 5dgt)

measuring heads

Various types of measuring heads are available, which can be used depending on the nature of the measuring object. The standard length of the measuring head cable is 1,5 m. The cable length of the measuring heads can be customized. Available lengths: 3 m, 4 m, 5 m, 7 m, and 10 m

BILD	Measuring head	Application	Pin spacing	Pin tip Ø	Spring pressure	Probe tester
	ASR measuring head RMH501	Standard accessories	5.0 mm	0.37 mm	210g/pin	RMH304
	ESR measuring head RMH502	non-uniform samples	5.0 mm	2 mm	240g/pin	RMH304
	LSR measuring head RMH503	soft surfaces	5.0 mm	2 mm	130g/pin	RMH304
	QR measuring head RMH505	smallest samples	1.5 mm	0.26 mm	70g/pin	RMH313
	PSR measuring head RMH504	small & thin samples	1.5 mm	0.26 mm	70g/pin	RMH311
	BSR measuring head RMH506	large samples	2.2 mm	0.37 mm	210g/pin
	NSCR measuring head RMH507	hard surfaces silicon wafer	1.0 mm	0.04 mm	250g/pin	RMH312

Further practical application examples

1. Development of conductive plastics for ESD applications
   When formulating plastics with electrically conductive additives (e.g., carbon black, graphene, CNTs), the Loresta-GX II is used to determine the sheet resistance in Ω/□ to ensure that the material meets antistatic properties (typical target range: 10⁵–10⁹ Ω/□).
2. Optimization of coating processes in semiconductor manufacturing
   Thin conductive layers (e.g., ITO, PEDOT:PSS) are tested for their homogeneity and resistivity. The device can be used to measure specific resistivity at specific points or across a large area, allowing process parameters to be adjusted.
3. Evaluation of conductive printing pastes and inks
   For printed electronics (e.g. for flexible displays or RFID tags), the device is used to measure the electrical resistance to ensure functionality and to compare different formulations.
4. Material characterization for fuel cells or supercapacitors
   Electrode materials with high resistivity requirements (S/cm range) are precisely measured to optimize performance data such as internal resistance and current density capability.

We measure your materials with the Loresta-GX II

We are aware that the precision and quality of the measurement results are crucial for you. That's why we offer you the opportunity to... Material samples as a service to have us measure it. Our competent team ensures that every sample is processed with the utmost care and accuracy.

After each measurement with the Loresta-GX II resistivity meter, you will receive a comprehensive test report that includes detailed information and analyzes of your material samples.

Our pricing for this service is transparent and depends on the number of samples to be measured. This enables you to use our high-quality measurement services flexibly and cost-effectively. You also have the opportunity to extensively test the performance and precision of the Loresta-GX II before making your own investment.

In addition, we offer the following services:

• Pre-presentation and demonstration at our company location in Willich, Germany or directly at your location.
• Test measurement in advance: Test the performance of our devices with a test measurement of your material samples.
• Support in German & English: We offer technical support in German and English – professional, competent and reliable.
• commissioning and training: Our experts will install your measuring devices directly at your premises and train your employees to ensure smooth operation.
• Maintenance and service contracts for long-term reliability and performance of your devices
• Local contact: Our experienced team is always available to provide you with technical advice and support.
• warranty: Our devices are covered by a 12-month warranty.
• Free delivery including customs clearance: We take care of the complete customs clearance and deliver the measuring devices directly to you.

Contact Please contact us for an individual offer or further information. We are always available and look forward to assisting you with your measurement needs.