ProChrono Digital. Bought it on Amazon for $119 and free shipping. Then I spring for the $49 usb interface to my laptop. It comes with software and has full remote features with a 10' cable. I use it indoors with a 50 watt flood light about 4' above it and outdoors with natural light. I position it 12" from the muzzle. It operates flawlessly. The software has 3 displays. The main display consists of the remote controls, shot string and calculations such as fpe and string average. The two optional displays are a large current shot display and a running graph display. Data can be printed or stored in various formats such as pdf or excel. It operates for about 20 hours on a 9v battery and has storage for an extra one. I am very pleased with mine. It really takes this hobby to a new level for me.Hope this helps.
I got my F-1 Chrony at Wally World but they are bad to sell out because of the price , but that was 2 or 3 years ago.