HM Digital CP-1000 Calibration Solution – 1000 ppm NaCl, 20-Pack
Maintain accurate TDS and EC measurements with the HM Digital CP-1000 Calibration Solution — a 20-pack of single-use 1000 ppm sodium chloride (NaCl) calibration packets designed for use with HM Digital TDS meters, EC meters, and inline controllers including the PSC-154.
Each packet contains 20 ml of precisely formulated 1000 ppm NaCl solution, sealed with a tamper-evident closure to guarantee solution integrity from the factory to your calibration procedure. Single-use format eliminates cross-contamination risk and ensures every calibration uses a fresh, uncontaminated standard.
Why Regular Calibration Matters
TDS and EC meters drift over time due to probe fouling, temperature cycling, and normal electrode aging. An uncalibrated meter can read significantly off from actual values — leading to incorrect nutrient dosing in hydroponics, missed water quality exceedances in RO systems, or inaccurate process data in industrial applications. Regular calibration against a certified reference standard is the only way to verify and correct meter accuracy.
The CP-1000’s 1000 ppm NaCl standard is the most widely used reference point for TDS meter calibration, covering the measurement range relevant to drinking water, RO permeate, hydroponic nutrient solutions, and light industrial process water.
Key Features
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1000 ppm NaCl standard — the most common TDS calibration reference point, compatible with the majority of HM Digital TDS and EC meters
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Single-use 20 ml packets — eliminates cross-contamination between calibrations; each packet is used once and discarded
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Tamper-evident sealed closure — guarantees solution integrity; any compromise to the seal is immediately visible before use
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20-pack format — sufficient for 20 individual calibration procedures; ideal for labs, commercial facilities, and multi-meter operations
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Ready to use — no dilution or preparation required; open the packet and calibrate immediately
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HM Digital compatible — formulated for use with HM Digital TDS meters, EC meters, and inline controllers
Compatible Instruments
The CP-1000 is designed for use with HM Digital instruments including:
- HM Digital TDS meters (handheld and inline models)
- HM Digital EC meters
- HM Digital PSC-154 TDS/EC Controller
- Other HM Digital controllers and monitors requiring 1000 ppm NaCl calibration
Also compatible with most third-party TDS and EC meters that use 1000 ppm NaCl as a calibration standard.
How to Calibrate Your TDS Meter Using CP-1000
- Allow your meter and the calibration solution to reach the same ambient temperature (temperature affects TDS/EC readings)
- Open one CP-1000 packet — check the tamper-evident seal is intact before use
- Pour the 20 ml solution into a clean calibration cup or container
- Immerse the meter probe in the solution and allow the reading to stabilize
- Adjust the meter’s calibration setting until it reads 1000 ppm (refer to your meter’s manual for the specific calibration procedure)
- Remove the probe, rinse with distilled water, and dry before returning to service
- Discard the used packet — do not reuse calibration solution
Recommended Calibration Frequency
For most applications, calibrate your TDS or EC meter:
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Monthly — for general water quality monitoring and drinking water applications
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Weekly or before each use — for critical applications including hydroponics, aquaculture, and commercial RO systems where measurement accuracy directly affects product quality or yield
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After probe cleaning or replacement — always recalibrate after any maintenance that affects the probe
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When readings seem inconsistent — unexpected readings are often a calibration issue, not a water quality issue
Product Specifications
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SKU: CP-1000 | UPC: 891144000434
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Solution concentration: 1000 ppm NaCl (sodium chloride)
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Packet volume: 20 ml per packet
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Pack quantity: 20 single-use packets
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Closure: Tamper-evident sealed
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Weight: 1.5 lbs (full 20-pack)
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Vendor: HM Digital
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Country of origin: South Korea
Frequently Asked Questions
What is the CP-1000 calibration solution used for?
The CP-1000 is a 1000 ppm NaCl reference standard used to calibrate TDS meters, EC meters, and inline water quality controllers. Calibration verifies and corrects meter accuracy by comparing the meter’s reading against a known reference concentration.
Why use single-use calibration packets instead of a bulk bottle?
Single-use packets eliminate cross-contamination between calibrations. A bulk calibration solution bottle can become contaminated over time through repeated probe immersion, exposure to air, or improper storage — degrading the solution’s accuracy as a reference standard. Each CP-1000 packet is used once and discarded, guaranteeing a fresh, uncontaminated standard for every calibration.
Is the CP-1000 compatible with non-HM Digital meters?
Yes. The CP-1000 is a standard 1000 ppm NaCl solution compatible with most TDS and EC meters that use 1000 ppm NaCl as a calibration reference, regardless of brand. Check your meter’s manual to confirm the required calibration standard concentration.
How often should I calibrate my TDS or EC meter?
For general water quality monitoring, monthly calibration is typically sufficient. For critical applications — hydroponics, aquaculture, commercial RO systems — calibrate weekly or before each use. Always recalibrate after probe cleaning, probe replacement, or any maintenance that affects the probe.
Can I reuse a CP-1000 packet?
No. Each packet is designed for single use. Once opened and used for calibration, the solution may be contaminated by probe contact and should be discarded. Reusing calibration solution risks inaccurate calibration results.
What does the tamper-evident seal guarantee?
The tamper-evident closure guarantees that the solution has not been opened, diluted, or contaminated between manufacture and use. If the seal is compromised when you receive the packet, do not use it for calibration — contact the supplier for a replacement.
Where is the HM Digital CP-1000 made?
Manufactured in South Korea by HM Digital, a specialist in water quality measurement instrumentation and calibration standards.
