Need to borrow..portable TDS

[Rone]

My rodi is reading 0 but for some strange reason diatoms are kicking in. No real changes in tank. Running MH that are 9 months old.
Did increase flow and moved a bit. Do water changes ever 2 weeks at 25 gallons for 120 total water volume.
Would like to check my rodi with another meter.

 

[PSU4ME]

I believe I have one, in hopkinton if its worth the ride for you.

 

[William]

I have one in Milford.

 

[Jim Tansey]

You can also check some distilled water from the store, should read "0".

Jim