Diabetic Diabetes Health

He is 55 and works hard labor in heat from 5am to 6pm, 13hrs, monday through friday. He is about 5′5" and only 125lbs. He used to weigh more, but he lost about 20lbs in half to one year. He’s always eaten healthy because he actually dislikes many junk foods. He eats a ton of food, about twice as much as I eat, and i eat normal. He recently saw his friends and they noticed his weight loss and were concerned that it may be diabetes.

He works where in a hot environment so he drinks a ton of water and goes to the bathroom often as well, which is like cause and effect. He’s worn glasses since 15 and told me just today his eyes couldn’t see really near things that were about 2feet from him. the further stuff were okay though.
It makes sense for him to be tired because he is working long hours of hard labor and he is aging. He is tired after work, but not excessive, i would say. He is cheerful after dinner, talks with us for a while, walk the dogs, and we all go to sleep around 10PM. is this "tired" enough to indicate diabetes? Recently he’s been cutting walking times short though bcause he says he feels like falling asleep. He has really strong will power to finish the tasks that needs to be done.

Also, my dad has been complaining of an itchy spot on his right leg for days and said it feels better when he puts hydrocortison cream on it… but that was like a week ago and i saw him putting on that stuff again last night.

How close are my dad’s indications to those of diabetes symptoms? i can’t determine the depth or severity of his case. I am pretty concerned though.

I live in a pretty small town, so what are my best bets at finding a blood sugar meter?What is the best(affordable as well) meter i could get my hands on quick? I have a walmart, local pharmacies, riteaid, and walgreen.

Thanks for reading all this to help me. I really appreciate it!!
Oh, btw, my dad said diabetes does not run in his family.