A FB friend is having a hard time figuring out the SB software and asked me to post these photos for her. She’s in the Upper Midwest and will be diving locally now - aka cold water. Has a drysuit on order. Used to live in FL and did tons of diving there. These SP regs are about 17 years old. Would prefer not to buy new. SP D400 second and MK20 first. Would these work down to 38-40F? She says thank you!