The Power Chek power supply indicator lets you know if your block heater or any other electrical appliance that needs to be powered is working. Power Chek has 2 indicator lights， green indicates current is available and red indicates it is getting to your appliance. Very inexpensive， compact， easy to use power supply indicator ideal for everything from automotive and transportation applications to more industrial power verification uses - Use with all 120-Volt circuits. Will test and continuously monitor the operation of: sump pumps， generators， compressors， lights， all vehicle block heaters， oil pans， heavy-duty equipment， battery warmers， extension cords， heater tapes， all electric tools， blankets， appliances and more.

Know that your blocker heater or other equipment has failed when you plug it in works on any electrical load by telling you that critical current is flowing through the circuit

Every operating circuit requires both voltage and current to successfully deliver power， power chek lets you quickly determine that you have both， green indicates voltage is present and red confirms that current is flowing

Highly visible from several feet， know from the comfort of your home or office that your vehicle is ready to go when you are， easy to use， affordable， portable， durable

Pays for itself the first time you avoid a tow call or a missed day of work， never be stranded again， power chek will give you peace of mind

Sectors: oil/gas/energy refineries military operation facilities constructions automotive/transportation entertainments health and safety

Amperage: Maximum 15 A / Minimum 0.5 A. Volts: Maximum 129 VAC / Minimum 105 VAC. Watts: Maximum 1800 W / Minimum 60W