What's the difference between the Topcon RLH5A and RLH5B?

There are 3 key differences between the RLH5A and RLH5B. The RLH5A is capable of capable of slope, while the RLH5B is not. The RLH5A has a longer range of 2,600ft diameter, while the RLH5B's range is 1,300ft diameter. The RLH5A is slightly more accurate at 1/16th of an inch at 100ft, while the RLH5B is 1/8 of an inch at 100ft.