I know how to adjust the calibration but you need a standard to assure its set correctly. What do i do?

You may buy the ORP calibration solution for our store, the following is the link, or you may buy the calibration solution from other sellers, you may use 225mV, 256mV or 400mV solution to calibrate your meter. https://www.amazon.com/calibration-solution-Oxidation-Reduction-Potential/dp/B01FS0G8WK/ref=sr_1_fkmr0_1?keywords=ORP+256mv+standard+solution&qid=1558509756&s=gateway&sr=8-1-fkmr0.

What’s the difference between this one which is green and the other one which is red? Is one newer than the other?

The Green one is new design with same function of red one(ORP-002).

Will this work to show the ionization - orp of my invigorated water purifier?

It will show the ORP rating of the water. However, Reduction Potential in water, without adding a supplement comes from splitting apart water molecules with electrolysis, creating negative ionized hydrogen. Oxidation is electron loss. Reduction is electron gain. A standard filter should not affect the ORP very much.. I dont know much about invigorated filter, but alkaline does not necessarily mean reductive.

Does this measure free chlorine levels?

Hi,it can only measures the oxidation-reduction potential (ORP) value of water, cannot measure free chlorine levels.

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ORP Meter, ORP Redox Meter Tester -1999~1999mV, 1-Point Calibration, Oxidation Reduction Potential, Aquariums, Swimming Pools, Water Treatment Systems, Aquaculture, Spa

ORP Meter, ORP Redox Meter Tester -1999~1999mV, 1-Point Calibration, Oxidation Reduction Potential, Aquariums, Swimming Pools, Water Treatment Systems, Aquaculture, Spa

Product ID: 76999410

📊Wide -1999~1999mV range

📱Compact & portable design

🛠️1-point calibration w/ screwdriver

€ 49.32

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Description

💧 Stay ahead of the curve with precision ORP testing anywhere, anytime!

EFFORTLESS CALIBRATION - 1-point calibration with included screwdriver ensures hassle-free, reliable readings every time.
VERSATILE WATER TESTING - Ideal for aquaculture, water treatment, swimming pools, and more—stay ahead in water quality management.
BUILT FOR ON THE GO PROS - Compact, shockproof case fits in your pocket—perfect for fieldwork, pools, aquariums, and spas.
PRECISION AT YOUR FINGERTIPS - Measures ORP from -1999 to +1999 mV in 1 mV increments for ultra-accurate water quality insights.
SMART TEMPERATURE COMPENSATION - Automatic adjustment from 0–50°C guarantees consistent accuracy regardless of environment.

The ORP Meter offers a professional-grade oxidation-reduction potential measurement from -1999 to +1999 mV with 1 mV resolution. Featuring user-friendly 1-point calibration, automatic temperature compensation (0–50°C), and a durable, compact design with shockproof casing, it’s engineered for accurate water quality testing across aquariums, pools, spas, aquaculture, and industrial water treatment. Portable and precise, it’s the essential tool for proactive water management.

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€ 49.32

Duties & taxes included

In stock

Sold byAmazon PortugalDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Portugal.

Secure transaction

ProDesertcart PRO

Fast, free shipping, member pricing & priority support.

Join PRO →

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TrustScore 4.5 | 7,300+ reviews

Fatima A.

Best international shipping I've ever tried. Worth every penny!

3 days ago

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ORP Meter, ORP Redox Meter Tester -1999~1999mV, 1-Point Calibration, Oxidation Reduction Potential, Aquariums, Swimming Pools, Water Treatment Systems, Aquaculture, Spa

Description

Specifications

Common Questions