It depends on how fussy you want to be. I like my meters, and for me,
55 dollars is not too much. I like to be fussy at times, and wanted to
see how accurate I could get with an at home battery set up, so I
needed the extra accuracy for my own purposes. Others say they make
perfectly good stuff with the ppm meter. They are all EC meters, at
least the ones I looked at; it depends on the calibration ( I decided
against doing additional calibration) and accuracy. I have had mine
for maybe 3 years? and the electrodes are fine. They might wear out
more if you are measuring salt water, but for our purposes, probably
not necessary. It is nice to have one that is immersible.
What I have heard is that if you have the tds (reads in Total
Dissolved Solids) meters, then you just have to double the reading.
And when you measure the water first, to see that it is good enough,
it needs to measure zero or below 2- someone correct me if I am in
error.
HM is a good company. Don't know about the seller, though. I got mine
from silverpuppy dot com
Kathryn
On Oct 26, 2009, at 1:47 PM, lk wrote:
Thanks Kathryn. The HM AP-2 does measure in EC as opposed to ppm. I
did notice that the sensor in the HM COM 100 is replaceable & it
does measure to a smaller increment 0.1. Are these things that one
needs to be concerned about or is it just an added plus?
Reason I ask is I need to be economical but also don't want to cut
myself short in getting the proper equipment to do the job right. :)
--- On Mon, 10/26/09, Clayton Family <[email protected]> wrote:
From: Clayton Family <[email protected]>
Subject: Re: CS>EC meter
To: [email protected]
Date: Monday, October 26, 2009, 1:09 PM
not about the company, but I have the HM COM 100 and love it. I
prefer one that reads directly in EC, not ppm, although the com 100
will also read ppm, I like my data straight, without having to
double the reading.
kathryn
On Oct 26, 2009, at 11:17 AM, lk wrote:
Found this website, http://www.eseasongear.com/tds1.html
Considering the HM Digital AP-2. Their prices seem to be very
reasonable. Any thoughts about this meter? Anybody have experience
with this company?
TIA
