Here is a compact EKG monitor that combines with your smartphone to give you heart readings in 30 seconds. The Wellue DUOEK-S Heart Monitor is compatible with iOS and Android devices. It also has an OLED display to show your readings even without your phone.
The device is pretty easy to use: simply put your finger on the electrodes for 30s to 5 minutes to start seeing results. Its battery is good for up to 500 measurements. The device has a measuring range of 30 to 250 bpm. Its companion app lets you download and print reports.[where to get it]