The two models are economic, compact and offer a range of special features:

"Unique 40A high-precision low current measurement--0.01A high-resolution, 1.6% high-precision measurement" "The clamps are slim, lightweight, and portable, making them ideal for use in small, confined spaces" "The large backlight display facilitates readings in dark environments" Starting current (inrush) functionality (319) allows measurement of the starting current of electrical and lighting equipment, for example. (319) Current frequency measurement Precision down to 0.01A and 0.1V 1000A/600A AC/DC current measurement (319/317) 600V AC/DC voltage measurement 4000Ω resistance measurement Continuity beeper Auto off function enhances battery life, meaning the instrument can work when you need it screen store ‘hold’ function for capturing a measurement result on the screen