Bluetooth communication and recording function (CM2100B only) current, voltage 20000 count true RMS automatic range clamp meter Standard non-contact AC voltage sensing (NCV) function VFC mode can filter high-frequency interference signals to accurate measurement data. AC frequency response up to 1000Hz Small size, easy to carry Please Note:Due to different batches, there may be differences in product appearance, color and printing, which not affect the use Colour:Blue Material:Plastic Package Contents: 1 * Digital Tester 1 * multimeter pen 1 * Screwdriver 1 * case Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.