Sam tells us about the different Klein non-contact voltage testers and how to select the right one for you.
For more information about these products visit:
https://www.kleintools.eu/search/ncvt

Klein Tools Non-Contact Voltage Tester NCVT-1 detects standard voltage in cables, cords, circuit breakers, lighting fixtures, switches, outlets and wires. A bright green LED will tell you the tester is working and also functions as a worklight. It changes to red and warning tones sound when voltage is detected.
Klein Tools Dual-Range Non-Contact Voltage Tester NCVT-2 automatically detects low voltage and standard voltage. A bright green LED will tell you the tester is working and also functions as a worklight. The light flashes red and two distinct warning tones sound when either low or standard voltage is detected.
Klein Tools NCVT-3 Non-contact Voltage Tester is a volt pen with an integrated flashlight. The voltage sensor detects 12-1,000V AC and indicates the presence of voltage in cables, cords, circuit breakers, light fixtures, switches, outlets and wires as well as AC voltage in doorbells, thermostats, low voltage lighting and irrigation systems. Includes both visual and audible signals. The NCVT-3 is rugged enough for any job site.
Klein Tools NCVT-4IR is a voltage tester that provides non-contact determination of AC voltage in cables, cords, circuit breakers, switches, outlets and wires; as well as infrared (IR) thermometer measurements, making it the perfect choice for HVAC professionals.
The Klein Tools NCVT-6 is a non-contact voltage tester with an integrated laser distance meter. It can detect voltage over the full-range from 12 to 1000 VAC and can measure distances from 2-Inch (51 mm) up to 66-Feet (20 m). The laser distance meter functions independently from the NCVT with a simple-to-use intuitive interface. Easy, single-button changes between voltage detection and laser distance measurements.