Do yourself a favor and get one thats waterproof. I have the milwauke C66 for EC and its been great for over a year now.no problems. I just got the ph55 ,I like it so far. I've had 2 of the the ph600 and it worked really well for about a year or so until it fell in the water.You will need to calibrate it a lot tho. Like mentioned earlier, eseasonsgear is an excellent place to get them. .....free shipping with an $20 order. You can get a ph600 and spare batteries with free shipping.Just dont get it wet