NET0316 - 12 Volt Digital Test Light. A must have toll for all basic trouble shooting and diagnostic work.  Very handy to check voltage numbers in circuits and battery as well as monitor voltage changes live.  Also indicates Positive or Negative Polarity with colored lights. A nice quality tool at a nice price. 
 
OPTION- NET0314- Very awesome handy set of five 3 foot long test leads with strong alligator clamps on both ends. We use these all the time here at our shop and have many of them and love them! Must have tools for any kind of electrical work and trouble shooting. 
 
OPTION- NET0315- This very useful tool will do multiple operations, it will test 6 to 24 DC voltage, polarity, it will also allow to to put power or ground to a circuit or accessory/bulb/switch/etc. It has 15 foot leads that hook to battery Pos and Neg, plus alligator jumper and probe on toll. Very similar to the famed "Power Probe Tool" but not at the $200 cost.  Multi-function Automotive Circuit Tester kit functions as Voltage and Polarity Test, Continuity Test,Signal Circuit Test, Components Activate,Check Bad Grounding, Locate Short Circuits, Circuit Breaker Protection, etc 
 
NOTE- We offer quality tools at fair prices, often many of these tools we use here or at the least tested them first hand and have been very happy with the quality and performance! That said they are offered with affordability and ease of use in mind for the "do it yourself-er" " they are not professional tools meant for 10 hours a day 7 days a week but are also a tenth of the cost of most of those caliber tools.