HM Digital 1000 ppm TDS Calibration Solution, 3 oz (90 ml)

NaCl Reference Solution for Calibrating TDS and EC Meters, 1000 PPM

A TDS or EC meter drifts out of calibration with regular use, and without a known reference point there's no way to tell how far off a reading has crept. This HM Digital solution is mixed to a precise 1000 PPM NaCl concentration, giving your meter a fixed reference point to calibrate against.

It ships in a lightweight 3 oz (90 ml) HDPE bottle sealed with a coated foam liner, sized for repeated calibration checks without wasting solution.

Key Features & Benefits

• 1000 PPM NaCl formula — mixed to a precise concentration for calibrating TDS and EC meters against a known reference point.
• 3 oz (90 ml) HDPE bottle — a lightweight, easy-to-store size that holds enough solution for repeated calibration checks.
• Coated foam liner seal — helps prevent leaks in storage and during pour-out use.
• Compatible with any TDS/EC meter — not limited to a single brand or model of meter.

Who Should Use This Calibration Solution

Growers and hobbyists running a TDS or EC meter who want to confirm or correct its calibration on a regular schedule, rather than trusting readings that may have drifted.

About HM Digital

HM Digital's product line covers pH, EC, and TDS meters along with the calibration and storage solutions that keep those meters accurate over time, including this 1000 PPM NaCl reference solution.

Frequently Asked Questions

What is this solution used for?

It calibrates TDS and EC meters against a known 1000 PPM reference point. Regular calibration against a fixed standard is what keeps a meter's readings trustworthy over time.

How much solution is in the bottle?

The bottle holds 3 ounces (90 ml), which is enough for multiple calibration sessions before it runs low. Store the bottle sealed between uses to keep the solution at its stated concentration.

How often should I calibrate my meter?

Check your specific meter's manual for its recommended interval, since this varies by model and how heavily the meter is used. As a general practice, calibrating every few weeks of regular use helps catch drift before it affects your nutrient dosing.

Will this solution work with any brand of TDS or EC meter?

Yes, a 1000 PPM NaCl solution is a standard reference point that works across TDS and EC meter brands, not just HM Digital models. Match the calibration procedure to your specific meter's instructions.