26 AMMETERS, VOLTMETERS, MILLIAMMETERS, MICROAMMETERS MILLIVOLTMETERS, VU METERS, CIRCUIT TUNING METERS, SHADOW TUNING METERS, MINIATURE BATTERY CHARGE INDICATORS, TACHOMETER METERS, PROXIMITY INDUCTION AMMETERS, MULTI-CIRCUIT BATTERY TEST METERS, LINE VOLTAGE TESTERS, DB METERS, NULL INDICATING METERS, AND ELECTRIC METER TYPE INDUSTRIAL INSTRUMENT INDICATOR DEVICES, INCLUDING, POLARITY INDICATORS, ON-OFF INDICATORS, AND CELL TEST INDICATORS