Reddit reviews HM Digital 716160 COM-100 WATERPROOF PROFESSIONAL SERIES Combo Meter, 7", White/Purple

http://www.amazon.com/gp/product/B000VVVEUI/ref=oh_details_o09_s00_i00?ie=UTF8&psc=1

It's this. Apparently I can measure in EC. Gonna have to read the manual. :-)

Thanks!

I got mine from Amazon for about 60 bucks. It has lasted me 2 years so far. Same for my ph meter at the same price point. As long as you properly maintain it these things will last.

HM Digital COM-100 Waterproof Combo Meter for EC, TDS and Temperature, 1-Pack https://www.amazon.com/dp/B000VVVEUI/ref=cm_sw_r_cp_api_GXPvzb690905F

I didn't even know that it had all those measurement settings until I had it for a while and then decided to read through the manual hah. I was measuring using a different conversion factor than tds Nacl and my ppm numbers were super high.

After changing to the NaCl conversion factor my numbers are much closer to the bounds I mentioned in my comment.

I was just on amazon looking for that a minute ago. I only have 50 bucks to spend right now and there is one for just under that.


Here it is.


I am not sure if this is also a ph meter, but I have no problems with ph, I'd just like to get my ppm right and bonus if I can get ph meter combo for the same price.


Does anyone have any experience with this or recommend a different $50 model?

Generally you should follow the instructions on the fertilizer as instructed, if there are any. Then test your water with a TDS meter to ensure you have acheived the right concentration. I use this one.

Hopefully you picked a water soluble fertilizer, preferably one meant for hydroponics. I have heard of getting by with other fertilizers such as miracle-gro but this kind seems like a hack job to me personally. General Hydroponics make some cheap and effective hydro concentrates that are a good place for beginners

http://www.amazon.com/Digital-COM-100-Waterproof-TEMP-Meter/dp/B000VVVEUI

This is all I need right? Will it come calibrated/with some solution?