[compost_tea] DO Meter- New and Used

From: TaChung Huang <tachung_h_at_yahoo.com>
Date: Sun, 19 Sep 2004 17:52:35 +0800

Hello to all:
Since it is Sunday and I have a used and a brand new DO Meter from
Extech.
Here is the list;;
 
Qty Item Description

=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
1 EX-407515 Heavy Duty Dissolved Oxygen Kit with 13ft Cable
1 EX-156119 117 VAC Adaptor

1 EX-780407 Replacement Membranes (5/pack)

=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-

If you are interested in these items. Please send me an e-mail off the
list.



Regards
TaChung Huang

-----Original Message-----
From: tomjasz [mailto:tom_at_livesoil.com]
Sent: Thursday, October 09, 2003 2:25 AM
To: compost_tea_at_yahoogroups.com
Subject: DO Meter


http://www.electrical-contractor.net/The_Store/EX/407510.htm

Some of us are using the Extech 407515, the model with a 13 foot
cable. With and added option of the Data Acquisition program and
cable a pc can log all activity by sampling every second or every 30
minutes or longer. Beater IBM pc can be had for little or nothing. I
have an ancient IBM that is useless for any other use and cost less
than 20 bucks, all it does is log DO.

Some aggressive shopping and the system can be had for
under $500USD


--- In compost_tea_at_yahoogroups.com, "dkemnitz2000"
<dkemnitz2000_at_y...> wrote:
> --- Hey Bob, That's exciting! What model meter did you use and
when
> and how did you calibrate it? Did you monitor the tea continuously
> or take grab samples (if so how often?) or dangle the probe in the
> tea in the middle or on top (with agitation)? Just wondering, as
I'd
> like to get an O2 meter but don't want to spend $400 on one and
find
> out it's inadequate or worse, not precise. What assumptions did
you
> make in designing the test? Dennis
>




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Received on Mon Sep 20 2004 - 00:24:58 EDT

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