1 x 3 4 for sale, brand-new and used.

MS8910 SMD SMT surface mount RC tester multimeter auto scan + battery pins FLUKE

Red LED Digital Display AC 0-300V Voltage Test Panel Voltmeter Product Name : 3 1/2 LED Voltmeter Voltage Detection Type : AC Voltage Measure Range : 0-300V LCD Display Size : 5 X 2.4cm/ 2" x 0.94"(L*W) Power Supply : DC 5V ±10%

I googled the patent number and found the following info. The figures on the patent sketches looks slightly different than the piece. Patent number: US 3497806

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Descriptions:

Measuring, analyzing and solving environmental problems is paramount for the successful HVAC service technician. The EM20 Thermo Anemometer diagnoses and solves air flow problems in HVAC systems