$43.70 isn't too bad and maybe not a bad meter, but you can do better.
Not sure what the measurement range is. "EC" isn't a "unit of electrical
conductivity" so far as I know so " 0- 20 EC " doesn't mean anything to me.
The spec should be in micro [uS] or milli -siemens [mS] or, like, mS/CC
of EC or uS/CC of EC
You would want a slightly higher range than 20 uS and better resolution
than mS increments.
Since the PPM range is 20,000 PPM, that indicates that EC is in Milli
Siemens or even Siemens
This one for $22.98 looks more suited..and it comes out of Florida vs Hong
Kong.
http://cgi.ebay.com/Digital-EC-Conductivity-Meter-Tester-Water-1999-s-cm_W0QQitemZ140347674771QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item20ad5f9093
Specifications:
* LCD display: 4 digits
* Measure Range: 0 ~ 1999 ¼s/cm
* Resolution: 1 us/cm
* Accuracy: ± 2% full scale
* Operating Temperature: 0 ~ 50 °C (32 ~ 122 °F)
* Power: 2 x CR2032 watch-type batteries included.
* Item size: approx. 150 (L) x 27 (W) x 20 (D) mm (5.91' x 1.06' x
0.79' inch)
* Item weight: approx. 46g with batteries installed.
* Calibrated at factory
* This listing does not include calibration fluid.
<http://shop.ebay.com/items/?_nkw=ec+meter&_in_kw=1&_ex_kw=&_sacat=See-All-Categories&_okw=ec+meter&_oexkw=&_udlo=&_udhi=&_ftrt=901&_ftrv=1&_sabdlo=&_sabdhi=&_samilow=&_samihi=&_sadis=200&_fpos=Zip+code&_fsct=&LH_SALE_CURRENCY=0&_fss=1&fsradio=%26LH_SpecificSeller%3D1&_saslop=1&_sasl=zmatt14&_sop=12&_dmd=1&_ipg=50>Click
here for EC meter listings that do for a few dollars more.
* Supplied with a mini-screw driver for calibration
* Automatic temperature compensation
You can get a proven brand name EC meter [HM Digital] for $30, free shipping.
Ode
At 05:18 AM 10/20/2009 -0700, you wrote:
It looks like EC meters are much less expensive than what I had seen
previously. One of the sites given to me earlier had a meter but it was
well over $100.
I hate to be a pain but would a meter such as this one on ebay
(<http://tinyurl.com/yzzzvbn>http://tinyurl.com/yzzzvbn) be appropriate
for these solutions?
Jeff
From: Ode Coyote <[email protected]>
To: [email protected]
Sent: Tue, October 20, 2009 6:56:17 AM
Subject: Re: CS>Getting Started
You can use a voltmeter to tell when to stop, but only on a given setup
that's always the same as referenced by an EC meter.
Current, electrode spacing and surface exposure have to be constants for
voltage to tell you anything.
In *making* CS, the voltage is nearly irrelevant, so it needn't be a
constant.
A PPM meter is an EC meter that dilutes the info it gets to suit "salt
water".
Ode
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