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Portable ORP Meter with Calibration Function, ORP Tester Range -1999 to 1999mV, for Aquariums, Swimming Pools, Water Treatment Systems, Aquaculture, Spa

Portable ORP Meter with Calibration Function, ORP Tester Range -1999 to 1999mV, for Aquariums, Swimming Pools, Water Treatment Systems, Aquaculture, Spa

Q: 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.

Q: 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).

Q: 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.

Q: Does this measure free chlorine levels?

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

Product ID: 253696406

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📏Wide -1999 to +1999 mV range

🔧1-point manual calibration

🛡️Shockproof portable case

Frequently Bought Together

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

YINMIK pH Meter Calibration Solution Kit(4.00,7.00&10.01) with pH Electrode Storage Solution Kit,3 Bottles pH Calibration Buffer Solution and 2 bottels KCL pH Probe Solution for pH Meters

ORP Oxidation-Reduction Potential REDOX 256mV Calibration Solution 50ml

Description

💧 Stay ahead of water quality—because your health deserves precision.

CALIBRATE LIKE A PRO - Includes screwdriver for easy 1-point manual calibration ensuring reliable, consistent readings every time.
INSTANT WATER SAFETY CHECK - Quickly assess oxidation-reduction potential to ensure your water is safe from harmful bacteria and viruses.
PRECISION AT YOUR FINGERTIPS - Measures ORP with ±5mV accuracy across an ultra-wide range for professional-grade water quality insights.
BUILT TO TRAVEL BUILT TO LAST - Compact, lightweight design with shockproof case lets you monitor water quality anywhere—poolside, spa, or aquaculture.
SMART TEMPERATURE COMPENSATION - Automatic adjustment from 0–50°C guarantees accurate results regardless of environmental changes.

This Portable ORP Meter offers professional-level oxidation-reduction potential measurement from -1999 to +1999 mV with 1 mV resolution and ±5mV accuracy. Featuring a large, clear display, 1-point manual calibration with included screwdriver, and automatic temperature compensation (0–50°C), it’s designed for versatile use in aquariums, pools, spas, and water treatment systems. Its compact, shockproof design and long battery life make it the ultimate on-the-go water quality tester for health-conscious professionals.

Specifications

Item Weight	132 g
Product Dimensions	15.49 x 3.1 x 1.57 cm; 131.54 g
Batteries	4 LR44 batteries required.
Item model number	ORP-228
Color Name	ORP Redox Meter
Country Produced In	China
Battery type	Alkaline
Power Source	Battery Powered

Have a Question? See What Others Asked

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

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

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

Does this measure free chlorine levels?

Common Questions

Are the products genuine and authentic?+

Yes, all products are sourced directly from authorized retailers in the US, UK, UAE and India. We maintain strict quality control processes and verify each product before shipping. All items come with applicable manufacturer warranties and are covered by our standard return policy.

How long does delivery take and is it reliable?+

Delivery times vary by destination country, typically ranging from 3-9 business days. Each order is fully trackable through our system. We handle all customs clearance and use reliable courier partners for last-mile delivery. You'll receive regular updates about your order status via email and our app.

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Desertcart is an international e-commerce platform operating since 2014. We securely process thousands of orders globally each day. Every product goes through our quality verification process before delivery, and we provide end-to-end order tracking, 24/7 customer support, and a comprehensive returns policy to ensure a safe shopping experience.

How is product pricing calculated?+

Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

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TrustScore 4.5 | 7,300+ reviews

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Excellent communication throughout the order process. Product is perfect.

2 weeks ago

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Fantastic experience overall. Will recommend to friends and family.

1 month ago

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TrustScore 4.5 | 7,300+ reviews

Rajesh P.

Customer service was outstanding when I had questions about the product.

2 days ago

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Perfect platform for hard-to-find items. Delivery was prompt.

1 month ago

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