ppm meter question

Jumpin

Active Member

• Jan 30, 2013

• #1

I have a TDS-3 meter and am not sure how to read it. It states it reads from 0-9999ppm however on the screen I am getting a reading of 124. Does this mean its really 1240ppm or actually 124ppm?

 

match box

Well-Known Member

• Jan 30, 2013

• #2

I don't know that meter but I would think it's 124. Thats what my meter would and your should be the same.

 

Jumpin

Active Member

• Jan 30, 2013

• #3

That could explain why my plant looks like hell. I need to add a lot more nutrients to her res. Thanks

 

N

Newbt

Member

• Jan 31, 2013

• #4

mine actually shows the 3 digit number and if ppm goes into the 1000's it has a x10 blinking on the side, not sure if yours is the same but wouldn't want you to up your nutes and fry the plants before checking.

 

superstoner1

Well-Known Member

• Jan 31, 2013

• #5

If it has 3 digit readout then, Yes,multiply by 10.

 

(818)MedicineMan

New Member

• Feb 1, 2013

• #6

Jumpin said:

I have a TDS-3 meter and am not sure how to read it. It states it reads from 0-9999ppm however on the screen I am getting a reading of 124. Does this mean its really 1240ppm or actually 124ppm?

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The TDS-3 website shows it reads 0 - 9999 PPM. I am inclined to believe it is a four digit readout. A simple test would be to mix a small batch of nutes strong enough to get a readout over three digits and see for yourself. You can then further dilute your mix unitl you are at the right PPM.

 

thatreedocta

Active Member

• Feb 1, 2013

• #7

(818)MedicineMan said:

The TDS-3 website shows it reads 0 - 9999 PPM. I am inclined to believe it is a four digit readout. A simple test would be to mix a small batch of nutes strong enough to get a readout over three digits and see for yourself. You can then further dilute your mix unitl you are at the right PPM.

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I agree. To check, measure distilled water (0 ppm), then tap water (around 250 ppm depending on area), and then a small glass of straight nutrients or ph up/down solution (high ppm in the thousands). By the way, im pretty sure yours means 124 and not 1240. Especially because i've never heard of a ppm meter/pen rounding instead of giving an exact measurement.

 

superstoner1

Well-Known Member

• Feb 1, 2013

• #8

Many entry level pens have a 3 digit screen and use a multiple of 10

 

GreenThumbSucker

Well-Known Member

• Feb 1, 2013

• #9

The manual says "If there is a flashing x10 next to the reading multiply it by ten" Google is your friend

http://www.filterwater.com/docs/hmdigital/hmdigital-tds3-manual.pdf