TDS meter - where and which ?

[mobile2007]

Which LFS got sell TDS meter ? how much they cost ? what brand ?

[stormhawk]

I use the HM digital brand. Got it from GC, price I forgotten but I think roughly $50?. Easy to use I like mine a lot.

[mobile2007]

thanks, stormhawk.

I use the HM digital brand. Got it from GC, price I forgotten but I think roughly $50?. Easy to use I like mine a lot.

[BuckeyeFieldSupply]

HM has a number of TDS meters, both handheld and "in-line." Handhelds go for less than $20 to about $60. Inlines go for about $30 to $45.

If you get a handheld, avoid the TDS-EZ as it doesn't include automatic temperature compensation (this is especially true if you are concerned with precise measurements near 0 ppm TDS).

Russ

[ralliart12]

I use the HM digital brand. Got it from GC, price I forgotten but I think roughly $50?. Easy to use I like mine a lot.

May I know the differences between the "MOSURA TDS/Conductivity Pen" & the "HM AP-1: AquaPro Water Quality Tester (TDS)"? (their prices are almost similar.)

Btw, can these meters be used forever without replacing any component inside?

[Navanod]

TDS meters generally last for very long as long as they are not abused. You may need to calibrate from time to time though, especially after every battery change.

[ralliart12]

TDS meters generally last for very long as long as they are not abused...

I'm very curious on how they work, i.e. they do not have a substance or component that gets "consumed" upon each test?

...You may need to calibrate from time to time though, especially after every battery change.

May I know if the meters will indicate if they require calibration? Or based on guess-work?

[stormhawk]

The meters are factory-calibrated initially. After some time, they will require calibration. Typically, it's probably good to re-calibrate once a month or so.

I'm using this meter from HM Digital: http://www.tdsmeter.com/products/ap1.html - AP-1 AquaPro

As for the difference between the Mosura and the HM Digital meters, I guess it's only the brand.

[felix_fx2]

Anyone bought Tds meters from those china sites?

[mobile2007]

dont ever buy, no warranty, reliability, and durability, accuracy.

Anyone bought Tds meters from those china sites?

[Navanod]

I'm very curious on how they work, i.e. they do not have a substance or component that gets "consumed" upon each test?

May I know if the meters will indicate if they require calibration? Or based on guess-work?

I believe the meter works by simply measuring an electrical current between 2 electrodes? These are stainless steel and more or less like 2 wires which should not be depleted. Corrosion or being covered with crap will likely degrade them but that should not happen under normal usage.

I calibrate with a 200 TDS reference solution each time I change batteries. I notice that as the batteries weakens, the readings also go off quite a fair bit so do not try to max out the batteries, just change when the digital display looks faded.

Anyone bought Tds meters from those china sites?

My meter is from a local ebay seller. About $30 and works ok. Only thing is it's factory calibrated and cannot be adjusted. So now I just have to remember that it's 13 TDS too low (based on last calibration) and add 13 to my readings.
China sites, better not try.

I'm thinking of upgrading to a unit that can read EC...hehe

[cheetf]

Try cleaning the probes with a cotton bud. You'll probably be surprised by the readings after that.

[Navanod]

Huh? You mean for me? Hmmmm...I'll go try later tonight

[ralliart12]

...I calibrate with a 200 TDS reference solution each time I change batteries...

May I know where to get such a solution?

[Daniel_Lee]

Is the mosura one good? approximately how much?

[framejumb0]

Today i bought HM digital AP-1 from Petmart.Quite satisfied with display and build quality. It has automatic temperature compensation and can be digitally calibrated using NaCl solution.

Found out the Bedok tap water is 62ppm and my tank water ~85ppm.

[wilson413]

Is the mosura one good? approximately how much?

they ar not bad around $50 if i am not wrong.. u can drop by GC..

[gabriel]

I just bought a HM Aquapro Digital TDS from GC at $55. Hope that helps.

[Loudness]

i just got a mosura TDS meter, anyone know how to calibrate it? and where to get the solution?

thanks

[IllusionImage]

I bought my mosura Tds meter from c328 about $50. It comes with the solution. If not, I know green chapter is selling it.
Just fill a container up, pull the meter into it and finally adjust the screw behind accordingly.

Can the solution be reuse? Normally throw them away after each reading.