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This range of LCD meters includes a 1Vd.c. analog style voltmeter elapsed hour meter, thermometer (+14 to +122F), 200mVd.c. voltmeter and 4V to 23V 2-wire voltmeter. Each module is 1.71" (w) x 0.34" (h). The round hole mounting method (meeting IP65) makes these meters very easy to fit.