Qianson DC 12V 24V 4-20mA Signal Source Signal Generator Constant Current Source 0.01mA With Polarity Protection<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>Easy to use， easy to wire， knob operation， in response to the output immediately after adjustment， no delay.</li><li>In order to achieve stepless fine adjustment， particularly multi-ring (5 * 360) potentiometer to adjust the actual fineness of up to 0.01 mA， operate freely.</li><li>Power port has a polarity protection， power reverse does not work， do not burn components.</li><li>The power supply voltage: 12V DC or 24V (tolerance 1 25%)， Total power &lt;1W.</li><li>The product can be used: signal sources， regulating valves， control， test instrumentation， light emitting diode test， the inverter output analog transmitter.</li></ul></div><img src="http://ecx.images-amazon.com/images/I/41KF2zsdRPL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/41pIPHYJk7L.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/51s9tCB5p3L.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/4142J4bExAL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/41KS3JYMjoL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/41ZxCsPiaxL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/41U5zJlrb7L.jpg" noproxy>