Sourcetronic's MPK-253 digital very low resistance ohmmeter is a portable, microprocessor-controlled instrument used to accurately measure resistances of  switches and circuit breaker contacts, transformer and motor windings, wire and cable samples, joints in busbars, etc., using  test currents from 1mA up to 10 A (MPK-203 up to 200 A). It uses the Kelvin-type, four-terminals measurement principle, thus eliminating errors caused by lead and contact resistances. Measurements accuracy is guaranteed by the state-of-the-art system for signal-amplification, offset-free and with long-term stability. 
The HOLD function keeps in the display the value measured at a certain time-point. The measurement circuit has an effective protection against voltage peaks  originated by those inductances.
Operation is very simple: Just connect the leads, switch-on the equipment, select the test current and press the start button. After a few seconds (depending on inductance of the element),  direct reading appears on the display with the measure unit indication (Ω, mΩ or µΩ).

ST2819 is an updated product of ST2817 LCR meter. With high accuracy, wide measurement range, 6-digit resolution, brilliant grafic-display and test frequency up to 200KHz with the step of 0.01Hz, signal level from 5mV to 2V and DC internal bias voltage, the meter can be widely used for quality control on production line, incoming inspection, and high-accuracy measurement in lab. A perfect HANDLER interface, RS232C interface and GPIB interface make it easy to build an automatic component test system, communicate with the computer and record the test results.

- Component RLC Meter
- Large character LCD display with backlight
- Frequencies: 100 Hz, 120 Hz, 1 kHz, 10 kHz (0.01% b.a.)
- Test parameter: L-Q, C-D, R-Q, |Z|-Q
- Basic accuracy:  ± 0.1 %
- 2 Signal source output impedance: 30Ω / 100Ω
- Mathematical functions: deviation, percent, comparator




A high voltage relay is used to operate at high voltages. Relays are used in a number of different applications, such as test-systems and process control. Electromechanical switching relays operates by passing a current through a wire wound coil to create a magnetic field which is used to close the relay. Thus, relays act as electromechanical switches. The HV Relay RL42 has two change over contacts and a strong breaking capacity of 5.000 VA.