Multimeter itself is realy good, but the smartphone aplication to it is pretty shitty, but if you are good at programming you definitely can write your own better. Problem with the app is that when the voltage changes from eg. 5mV to 3V the 3V is lower on the chart, it just doesn't apply units to the graph.
Example voltage measure: 3.861V -> swap probes -> -3.859V (error in tolerance)

Aug 13,2019

THE TESTER IS OF GOOD QUALITY .PERFECT FOR THE PRICE ...IM A AUTO ELEC WORKS WELL FOR TESTING BRAKE LIGHT CIRCUT WHEN ALONE

Jul 15,2019