1413 μS/cm Calibration Solution for TDS Meter, EC Meter, Water Tester Calibration Solution, 4 Bottles of 50mL, for Accurate Meter Calibration & Laboratory Testing

This is good quality, came double wrapped and a day earlier than stated. This kit saved me, my Ph pen was off and needed buffering solution asap, I got this delivered in 2 days. Will definitely order from here again. Customer support is really top notch, they contacted me about the product.

Great price for the amount of product I received. Works great to calibrate my EC meter

We’re pretty careful about regularly calibrating the meters we use with our aquariums and hydroponics, so good calibration solution is key. This stuff does the job well! It matches other solutions well enough for our home needs and comes in a small sealed bottle that’s perfect for calibrating a meter or two.If I was still running a lab I would not use this - there’s no date or lot number, nor is there an SDS or other information. It’s not traceable in any meaningful way. For the price, this is not surprising. It’s not that much cheaper by volume than nice brand name calibration solution, but the tiny bottles are nice.Fine for home and hobby use!

Product solution was week, half of what the bottle stated. Both new TDS read approx 700 when they should have read 1413. And yes i followed the directions. Imho, do not purchases. A $12 dolor item and they want you to drive to a drop off store. Time and Gas wow what a savings. Do not buy.

Works as described and good value

My conductivity meter recommends calibration at 1413 μS/cm, but it's nice that this company offers more than one strength calibration solution so that I can confirm accuracy over a wide range of salinities.

The easiest way to calibrate a meter. I've used the powder that you mix and I'm never sure if the water I started with is good enough. This takes the uncertainty out of the equation.

Extremely confusing for a lay person and with no instructions. I returned it for a refund.