Vivosun TDS

[CCbudz]

I purchased the vivosun ph and TDS/EC meters online. The ph meter came with calibration packets and I found the same ones online. The TDS meter has a cal button, but no instructions or calibration packets. Their customer service, which hasn’t been great, says it doesn’t need to be calibrated. Eventually, I feel it would be necessary, if not just for piece of mind. Anybody else use this tool, or have any solutions?

thanks!

[Rwise]

What I use cost a lot more and wants to be calibrated every 30 days, coming up on 30 days and I will test it with the 7.0 and 4.0 fluids.

[gbauto]

I've found that my ec meters really don't drift like a ph meter will.
You can purchase reference solutions to calibrate the ec meter, just like the ph pen.
I try to use a storage solution to keep the bulb immersed on my ph pen and it makes the meter more stable.