20 Best Hanna Orp Meter [2025]

Are you looking for the best Hanna Orp Meter? Based on expert reviews, we ranked them. We've listed our top-ranked picks, including the top-selling Hanna Orp Meter.

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# Preview Product
1 Hanna Instruments HI 98121 Combination pH/ORP/Temperature Tester Hanna Instruments HI 98121 Combination pH/ORP/Temperature Tester
2 Hanna Instruments HI98120 Waterproof ORP/Temperature Tester, +/-1000mV ORP, +/-2mV ORP Accuracy, 1mV... Hanna Instruments HI98120 Waterproof ORP/Temperature Tester, +/-1000mV ORP, +/-2mV ORP Accuracy,...
3 Hanna Instruments HI 9813-6N Waterproof pH/EC/TDS Temperature Meter Clean and Calibration Check for... Hanna Instruments HI 9813-6N Waterproof pH/EC/TDS Temperature Meter Clean and Calibration Check...
4 Bluelab MONGUACON Guardian Monitor Connect for pH, Temperature, and TDS in Water with Data Logging... Bluelab MONGUACON Guardian Monitor Connect for pH, Temperature, and TDS in Water with Data...
5 Apera Instruments, LLC-AI3719 PC60-Z Bluetooth Multi-Parameter Smart Tester Powered by ZenTest... Apera Instruments, LLC-AI3719 PC60-Z Bluetooth Multi-Parameter Smart Tester Powered by ZenTest...
6 Apera Instruments AI311 Premium Series PH60 Waterproof pH Pocket Tester Kit, Replaceable Probe,... Apera Instruments AI311 Premium Series PH60 Waterproof pH Pocket Tester Kit, Replaceable Probe,...
7 WaterGuru Sense Smart Pool Monitoring System | Chlorine & pH Pool Water Testing Smart Device WaterGuru Sense Smart Pool Monitoring System | Chlorine & pH Pool Water Testing Smart Device
8 Myron L 6PIIFCE Conductivity, Resistivity, TDS, pH, ORP/Free Chlorine, Temperature Meter Myron L 6PIIFCE Conductivity, Resistivity, TDS, pH, ORP/Free Chlorine, Temperature Meter
9 Hanna Combo pH/EC/TDS/C/PPM Tester HI98129 Hanna Combo pH/EC/TDS/C/PPM Tester HI98129
10 Bluelab METCOM Combo Meter for pH, Temperature, Conductivity (Nutrient) in Water with Easy... Bluelab METCOM Combo Meter for pH, Temperature, Conductivity (Nutrient) in Water with Easy...
11 HORIBA LAQUAtwin Na-11 Compact Sodium Ion Meter HORIBA LAQUAtwin Na-11 Compact Sodium Ion Meter
12 Hanna Instruments HIREEF Reef Professional Checker Kit V2 HI 772 - HI 758 - HI 774 - HI 98319 - HI... Hanna Instruments HIREEF Reef Professional Checker Kit V2 HI 772 - HI 758 - HI 774 - HI 98319 -...
13 Hanna Instruments HI70300L pH/ORP Electrode Storage Solution, 500mL (16.9oz) Bottle Hanna Instruments HI70300L pH/ORP Electrode Storage Solution, 500mL (16.9oz) Bottle
14 RCYAGO 2 in 1 Digital pH ORP Redox Controller WiFi Output Power Relay Monitor with Separate Relays... RCYAGO 2 in 1 Digital pH ORP Redox Controller WiFi Output Power Relay Monitor with Separate...
15 Bluelab CONTPHCON pH Controller Connect with Monitoring, Dosing, and Data Logging in Water (Stick... Bluelab CONTPHCON pH Controller Connect with Monitoring, Dosing, and Data Logging in Water (Stick...
16 Bluelab MONGUA Guardian Monitor for pH, Temperature, and Conductivity (TDS) Measurements in Water... Bluelab MONGUA Guardian Monitor for pH, Temperature, and Conductivity (TDS) Measurements in Water...
17 Apera Instruments Premium-Series PH60S Food pH Pocket Tester Kit, Swiss Spear pH Electrode, ±0.01... Apera Instruments Premium-Series PH60S Food pH Pocket Tester Kit, Swiss Spear pH Electrode,...
18 HORIBA LAQUAtwin Ca-11 Compact Calcium Ion Meter HORIBA LAQUAtwin Ca-11 Compact Calcium Ion Meter
19 RCYAGO 7 in 1 pH/RH/EC/CF/TDS(PPM)/ORP/Temperature Rechargeable Multi-Parameter Wall-Mount Water... RCYAGO 7 in 1 pH/RH/EC/CF/TDS(PPM)/ORP/Temperature Rechargeable Multi-Parameter Wall-Mount Water...
20 VIVOSUN pH and TDS Meter Combo, 0.05ph High Accuracy Pen Type pH Meter ± 2% Readout Accuracy 3-in-1... VIVOSUN pH and TDS Meter Combo, 0.05ph High Accuracy Pen Type pH Meter ± 2% Readout Accuracy...
Bestseller No. 1
Hanna Instruments HI 98121 Combination pH/ORP/Temperature Tester
  • One- or two-point manual pH calibration for obtaining results across a wide range
  • Non-clogging fiber junction and replaceable electrode to prolong life of meter
  • Automatic Temperature Compensation (ATC) eliminates need for extra calculations
  • Waterproof and floats if dropped in water
  • Large LCD screen for readability
Bestseller No. 2
Hanna Instruments HI98120 Waterproof ORP/Temperature Tester, +/-1000mV ORP, +/-2mV ORP Accuracy, 1mV...
  • Compact oxygen reduction potential (ORP)/mV and temperature tester used in industrial applications
  • Factory calibrated for ease of use
  • Dual-level LCD display screen simultaneously shows the current measurement and the current temperature
  • Replaceable electrode cartridge with an extendable cloth junction to extend meter life
  • Waterproof, dustproof housing allows the tester to float
Bestseller No. 3
Hanna Instruments HI 9813-6N Waterproof pH/EC/TDS Temperature Meter Clean and Calibration Check for...
  • Starter set with portable, water-resistant meter for testing pH, electroconductivity, and total dissolved solids, provided with solutions and sachets
  • Calibration check function to validate instrument performance
  • Automatic temperature compensation (ATC) to eliminate the need for extra calculations
  • Alert system when low battery and potential measurement error
  • On-screen user and calibration guides
Bestseller No. 4
Bluelab MONGUACON Guardian Monitor Connect for pH, Temperature, and TDS in Water with Data Logging...
  • Monitor pH up and down, temperature, nutrient (TDS) level in water to maximize your grow and ensure plants get a balanced feed; General uses includes...
  • This hydroponics tester has ATC that provides consistent reading regardless of any fluctuations in temperature; High and low alarm when outside...
  • Lab quality glass pH probe with easy two pointcalibration; Conductivity / temperature probe comes factory calibrated so it's ready to be used; Double...
  • Combine with Bluelab pen and meter for full garden nutrients monitoring in soil; Other features: International power supply, water resistant design;...
  • Made in New Zealand and manufactured by Bluelab, the industry leader in hydroponic testing equipment, built for growers; 2-Year Limited Warranty with...
Bestseller No. 5
Apera Instruments, LLC-AI3719 PC60-Z Bluetooth Multi-Parameter Smart Tester Powered by ZenTest...
  • Professionally measuring pH, conducitivity, TDS, salinity, resisitivity, and temp. has never been easier; also tests ORP (The ORP60-DA probe is...
  • Cloud-based data management system – allows you to record, manage, and share your test data at your finger tips, and never have to worry about data...
  • Comprehensive Information Display – 4 types of measurement display modes to serve you in different situations.
  • Upgraded pH sensor – More durable and easier to use
  • Hybrid design – This product can be used as a classic tester even without connecting to a smartphone.
SaleBestseller No. 6
Apera Instruments AI311 Premium Series PH60 Waterproof pH Pocket Tester Kit, Replaceable Probe,...
  • NOTE: A few drops of water are added to the electrode cap before the product leaves the factory. This is to maintain the sensitivity of the electrode....
  • Accuracy: 0.01 pH; range: -2.00 to 16.00 pH, 32 to 122˚F (0 to 50˚C); Auto. Power-Off: 8 minutes without operation
  • Easy 1-3 points auto. calibration, recognizes 5 types of solutions (1.68, 4.00, 7.00, 10.01, 12.46); Auto Temp. Compensation (ATC) ensures accuracy in...
  • High quality replaceable glass pH probe, suitable for regular water solutions e.g. pools&spas, hydroponics, environmental monitoring, cooling towers,...
  • Large LCD with 3 backlit colors (indicating different modes), dual display of temp./pH, and reminders of completed calibrations and stable readings
Bestseller No. 7
WaterGuru Sense Smart Pool Monitoring System | Chlorine & pH Pool Water Testing Smart Device
  • BRING SMART HOME TECHNOLOGY TO YOUR BACKYARD: Achieve safer pool water with state of the art technology.
  • EASY TO USE & GIVES EXPERT ADVICE: Simplify your pool care forever with automated monitoring and expert advice
  • NO HIDDEN FEES: No subscription fees. No hassle. Keep your pool protected around the clock.
  • MEASURE POOL LEVELS IN APP: Sends Free Chlorine, pH, temperature and flow to the mobile app 24/7. Access your pool data anytime, anywhere.
  • CUSTOMIZED POOL TREATMENT ADVICE: Sends data for customized pool treatment advice straight to your smartphone. Compatible with iOS and Android...
SaleBestseller No. 8
Myron L 6PIIFCE Conductivity, Resistivity, TDS, pH, ORP/Free Chlorine, Temperature Meter
  • LSI/Hardness Calculator
  • Auto ranging
  • Adjustable Temperature Compensation
  • Adjustable Conductivity/TDS Ratio
  • Date & Time Stamp
Bestseller No. 9
Hanna Combo pH/EC/TDS/C/PPM Tester HI98129
  • Automatic calibration at one or two points with two sets of memorized buffer values for ease of use
  • Replaceable electrodes to prolong life of meter
  • Automatic temperature compensation (ATC) eliminates need for extra calculations
  • Waterproof and floats in water
  • Automatic shut-off to extend battery life
SaleBestseller No. 10
Bluelab METCOM Combo Meter for pH, Temperature, Conductivity (Nutrient) in Water with Easy...
  • Monitor 3 parameters in water: Conductivity (TDS) level to ensure plants get a balanced feed, pH up and down, and temperature with lab quality glass...
  • This hydroponics meter has ATC that provides consistent reading regardless of any fluctuations in temperature; pH probe is double junction;...
  • Combine with Bluelab meters and controllers for full indoor garden nutrients monitoring in water and soil; pH probe requires easy two point...
  • Other features: Auto off function, low battery indicator, units for temperature; KIT INCLUDES: AAA batteries, pH probe storage cap, and calibration...
  • Made in New Zealand and manufactured by Bluelab, the industry leader in hydroponic testing equipment, built for growers; 5-Year Limited Warranty with...
Bestseller No. 11
HORIBA LAQUAtwin Na-11 Compact Sodium Ion Meter
  • Battery: 1 x 3 v Cr2025 battery (included)
  • Display type: lcd
  • Meter type: tester
  • Min ise: 23 to 2300 ppm
  • Ph accuracy: 10 percent
Bestseller No. 12
Hanna Instruments HIREEF Reef Professional Checker Kit V2 HI 772 - HI 758 - HI 774 - HI 98319 - HI...
  • Digital equipment for accurate results!

  • Complete kit includes everything you need, so you can start testing today.

  • Specifically chosen for use in saltwater reef aquariums!

  • Provides quick and accurate results.

  • Small size, big convenience Ideal for: Aquariums, Environmental, Aquaculture, Water Quality.

Bestseller No. 13
Hanna Instruments HI70300L pH/ORP Electrode Storage Solution, 500mL (16.9oz) Bottle
  • pH/ORP electrode storage solution
  • To minimize clogging and ensure fast response time, always keep the glass bulb and the junction of your pH electrode moist
  • Store the electrode with a few drops of HI70300 storage solution in the protective cap
  • Size: 500ml
  • Pack of 1
Bestseller No. 14
RCYAGO 2 in 1 Digital pH ORP Redox Controller WiFi Output Power Relay Monitor with Separate Relays...
  • 2-in-1 Water Quality Tester: 2-in-1 pH and ORP Controller measures and displays both pH value and redox value (ORP), comes with a BNC socket electrode...
  • Instant Measurement: Dual measurement display shows pH value at 0.00 to 14.00pH and ORP value at -1999 to 1999mV simultaneously. No need to press any...
  • Detachable Electrode: Both electrodes are detachable, they can be replaced easily at any time. As for the relay output power sockets, you can plug in...
  • Relay Output Power Control: Plug in your own device (e.g. oxygen pump, CO2-regulator, O3 ozonizer, or other pH & ORP generation devices) into the...
  • Wide Applications: Ideal for anywhere that requires water quality monitoring, e.g fish hatchery, wine production, swimming pool (bath), laboratories,...
Bestseller No. 15
Bluelab CONTPHCON pH Controller Connect with Monitoring, Dosing, and Data Logging in Water (Stick...
  • 24/7 test, monitor control (doser) for your pH up and down in water to maximize your grow and ensure plants get a balanced feed (nutrients) with lab...
  • This hydroponics digital tester has ATC that provides consistent reading regardless of any fluctuations in temperature; High and low alarm when...
  • Automated dosing with intuitive on-time/off-time for single-direction control; Combine with conductivity (TDS) pen and other meters for full garden...
  • KIT INCLUDES: Calibration solution, replaceable pump, dosing tube, pH and temperature probes, international power supply, Bluelab Connect Stick 2 and...
  • Made in New Zealand and manufactured by Bluelab, the industry leader in hydroponic testing equipment, built for growers; 2-Year Limited Warranty with...
SaleBestseller No. 16
Bluelab MONGUA Guardian Monitor for pH, Temperature, and Conductivity (TDS) Measurements in Water...
  • Monitor pH up and down, temperature, nutrient (TDS) level in water to maximize your grow and ensure plants get a balanced feed; General uses includes...
  • This hydroponics tester has ATC that provides consistent reading regardless of any fluctuations in temperature; High and low alarm when outside...
  • Lab quality glass pH probe with easy two point calibration; Conductivity / temperature probe comes factory calibrated so it's ready to be used; Double...
  • Combine with Bluelab pen and meter for full garden nutrients monitoring in water and soil; Other features: International power supply, water resistant...
  • Made in New Zealand and manufactured by Bluelab, the industry leader in hydroponic testing equipment, built for growers; 2-Year Limited Warranty with...
Bestseller No. 17
Apera Instruments Premium-Series PH60S Food pH Pocket Tester Kit, Swiss Spear pH Electrode, ±0.01...
  • Swiss spear sensor with Long-life reference system (Replaceable), made for cheese, sushi rice, meat, fruit, milk, yogurt, sauce, and other...
  • Easy auto. calibration with auto. temperature compensation (ATC)
  • Unique high/low value alarm function, instantly reminding you of any results that need your attention with a red backlight
  • Large clear LCD with 3 backlit colors (indicating 3 different modes), dual display of temp. /pH, and indications of completed calibrations and stable...
  • Complete test kit with ready-to-use calibration solutions, calibration bottles, storage solutions, AAA batteries, and a lanyard all in a portable...
Bestseller No. 18
HORIBA LAQUAtwin Ca-11 Compact Calcium Ion Meter
  • Autocalibration function recognizes standards and is user-selectable for either one- or two-point calibrations
  • Auto range change
  • Temperature conversion
  • IP67 waterproof
  • Auto hold
Bestseller No. 19
RCYAGO 7 in 1 pH/RH/EC/CF/TDS(PPM)/ORP/Temperature Rechargeable Multi-Parameter Wall-Mount Water...
  • Measurement Range: pH: 0.00~14.00pH; TDS: 10~19990ppm; EC: 0.00~19.99EC; CF: 0.0~199.9CF; RH: 10%RH ~ 99%RH; ORP: 0 ~ ±1999; Temp: 0~55°C...
  • Digital water quality tester widely used to measure the pH/RH/Conductivity EC/CF/TDS(PPM)/ORP/Temperature of water. Clear LCD with backlight, 3...
  • Before the calibration, please turn it off and fully charge. If you need to calibrate, please refer to the instruction manual. Easy calibration of pH...
  • Test temperature in ℃ / ℉(switchable unit). Automatic temperature compensation. Imported IC and high-cost performance. pH calibration powders and...
  • Digital pH Meter Apply in water sources, aquarium, hydroponics, laboratory, spas, swimming pools, and other water systems. Easy to use and provides an...
SaleBestseller No. 20
VIVOSUN pH and TDS Meter Combo, 0.05ph High Accuracy Pen Type pH Meter ± 2% Readout Accuracy 3-in-1...
  • Application: Great for all home and laboratory TDS & pH testing applications including aquariums, swimming pools
  • PH Meter: Full measurement range of pH 0 - 14, reliable and quick readings
  • 3-in-1 TDS Meter: Measurement Range 0-9990ppm, 0-9990µs/cm; Accuracy ± 2%, 0.1- 80.0°C, 32.0-176.0°F; Note: This meter can't test sea water
  • Features: Comes with protective case; Lightweight, handheld design for portability and convenience
  • Included: PH meter, 3-in-1 TDS meter, 3 calibration buffers

Having trouble finding a great Hanna Orp Meter?

This problem is well understood by us because we have gone through the entire Hanna Orp Meter research process ourselves, which is why we have put together a comprehensive list of the best Hanna Orp Meters available in the market today.

After hours of searching and using all the models on the market, we have found the best Hanna Orp Meter for 2023. See our ranking below!

How Do You Buy The Best Hanna Orp Meter?

Do you get stressed out thinking about shopping for a great Hanna Orp Meter? Do doubts keep creeping into your mind?

We understand, because we’ve already gone through the whole process of researching Hanna Orp Meter, which is why we have assembled a comprehensive list of the greatest Hanna Orp Meter available in the current market. We’ve also come up with a list of questions that you probably have yourself.

John Harvards has done the best we can with our thoughts and recommendations, but it’s still crucial that you do thorough research on your own for Hanna Orp Meter that you consider buying. Your questions might include the following:

  • Is it worth buying an Hanna Orp Meter?
  • What benefits are there with buying an Hanna Orp Meter?
  • What factors deserve consideration when shopping for an effective Hanna Orp Meter?
  • Why is it crucial to invest in any Hanna Orp Meter, much less the best one?
  • Which Hanna Orp Meter are good in the current market?
  • Where can you find information like this about Hanna Orp Meter?

We’re convinced that you likely have far more questions than just these regarding Hanna Orp Meter, and the only real way to satisfy your need for knowledge is to get information from as many reputable online sources as you possibly can.

Potential sources can include buying guides for Hanna Orp Meter, rating websites, word-of-mouth testimonials, online forums, and product reviews. Thorough and mindful research is crucial to making sure you get your hands on the best-possible Hanna Orp Meter. Make sure that you are only using trustworthy and credible websites and sources.

John Harvards provides an Hanna Orp Meter buying guide, and the information is totally objective and authentic. We employ both AI and big data in proofreading the collected information.

How did we create this buying guide? We did it using a custom-created selection of algorithms that lets us manifest a top-10 list of the best available Hanna Orp Meter currently available on the market.

This technology we use to assemble our list depends on a variety of factors, including but not limited to the following:

  1. Brand Value: Every brand of Hanna Orp Meter has a value all its own. Most brands offer some sort of unique selling proposition that’s supposed to bring something different to the table than their competitors.
  2. Features: What bells and whistles matter for an Hanna Orp Meter?
  3. Specifications: How powerful they are can be measured.
  4. Product Value: This simply is how much bang for the buck you get from your Hanna Orp Meter.
  5. Customer Ratings: Number ratings grade Hanna Orp Meter objectively.
  6. Customer Reviews: Closely related to ratings, these paragraphs give you first-hand and detailed information from real-world users about their Hanna Orp Meter.
  7. Product Quality: You don’t always get what you pay for with an Hanna Orp Meter, sometimes less, and sometimes more.
  8. Product Reliability: How sturdy and durable an Hanna Orp Meter is should be an indication of how long it will work out for you.

John Harvards always remembers that maintaining Hanna Orp Meter information to stay current is a top priority, which is why we are constantly updating our websites. Learn more about us using online sources.

If you think that anything we present here regarding Hanna Orp Meter is irrelevant, incorrect, misleading, or erroneous, then please let us know promptly!

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FAQ:

Q: How accurate is this pH and ORP tester?

A: This accurate pH and ORP tester features 0.01 pH resolution with automatic two-point calibration and temperature compensation in a single, portable, pocket device. No more switching between meters for your routine measurements.

Q: What are the characteristics of an ORP meter?

A: An ORP meter must be chemically inert; it cannot be oxidized or reduced itself. It must also have the proper surface characteristics to promote rapid electron exchange, a property known as high exchange current density.

Q: Can the hi98121 monitor pH and ORP at the same time?

A: With the HI98121 it is possible to monitor both pH and ORP at the same time. The HI98121 is commonly used to monitor pH and chlorine for many applications including swimming, food sanitization, plating wastewater treatment, and cooling tower water treatment.

Q: What materials are used to make ORP sensors?

A: Two noble metals have proven to work well for this purpose: pure platinum and pure gold are both used in the construction of ORP sensors. automatic, one or two-point with two sets of standard buffers (pH 4.01 / 7.01 / 10.01 or 4.01 / 6.86 / 9.18)