I bought this 603CG with bluetooth and B03CG I didn't use bluetooth although I saw that it saves time. I found this item to be more durable, it has metal, aluminum I believe, guards over the lasers. Whereas B03CG had hardened plastic. I left B03CG for several reasons. A laser appears to be identical. Second, it came with a hard case that was the perfect place to store the laser detector (LR-6RG). Third, it was slightly cheaper. Fourth, I love the fact that it has a USB Type-C charger. And so that you can charge the battery both directly and via the block. Both are excellent lasers and I have tested them with a detector at over 200 feet. I'm not sure how accurate they are at that range, just wanted to see how far they would go. Both also came with a coupon for a free tripod if you leave a review. However, this device also has its advantages: It has an adapter, so if the battery runs out, you can put a couple of double batteries in the power supply to get you through the day. However, these things appear to be stressed for many hours. I think I charged them after 3 days of use. The B03CG also has a larger battery but no backup option. I also liked the B03CG's magnetic swivel mount better, if I used a magnet it was less likely to want to tip over. Overall, both offer excellent value for money. I would be happy with both. Both work the same way and are easy to use and understand with a few minor changes. It blinks when misaligned in self-align mode.
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