Máy đo điện trở cách điện Gossen Metrawatt M540E
Analog Insulation and Resistance Measuring Instrument with Voltage Measuring Range
    - Insulation measurement with 100, 250 and 500 V measuring voltages
 
    - With analog display
 
    - Low-resistance measurements for protective conductor and equipotential bonding conductor resistance, and continuity
 
    - Buzzer indicates alarm status for erroneous and implausible measurements
 
    - Blinking LED serves same purpose
 
    - Fluttering pointer as last resort warning function Includes carrying pouch