Great Aquariums Start Here
Live Chat Support
    Free Shipping On $75+
  • FREE Shipping On $75+
  • 14-Day Low Price Guarantee
  • Low Price Guarantee
  • Same Day Shipping
  • Same Day Shipping
FREE Shipping on
Orders Over $75
Standard ground shipping (1-7 business days) starts at a low $4.99 and most orders over $75 ship FREE. Learn More
If you find a product we sell for a lower price at another online store, we will match their price—today and up to 14 days after you've purchased the item! Learn More
Same Day Shipping
We promise to ship your order as fast as humanly possible. In fact, 99% of orders placed before 6 pm EST ship the same day! Learn More
Home » Saltwater Aquarium Supplies  » Testing Equipment  » Monitors & Controllers  » Multi Item Monitors & Controllers  »  Hanna Instruments Combination pH and ORP Tester
Hanna Instruments Combination pH and ORP Tester

Hanna Instruments Combination pH and ORP Tester

Average Rating 4 7
Write A Review
Product Review
We value your opinion & experience
Thank you for taking the time to review our products!

This is a Product Review for: Hanna Instruments Combination pH and ORP Tester
Name to display on the review:
Location (ex: Anaheim, CA):
Your experience level:
How would you rate this product?
Review Title:
Write your review:
(Please focus on product quality and performance)
LOW STOCK ALERT: Only 1 left—order now!
In Stock: Buy now and your order will ship the next business day
Item #:
Notify Me
Just enter your email address below and we'll let you know when the product you are looking for becomes available!

Item Code:
Your Email:
Add to Cart or Notify Me
This item is temporarily unavailable but will be back in stock soon.

Item #
Click the Add To Cart button below if you'd like to reserve this item today. Any other items included in your order will be immediately processed and shipped. We will ship this item separately as soon as it arrives. We will not charge you for this item until it ships and you will incur no additional shipping charges.
Enter your email address in the field below and click the Notify Me button if you'd like us to send you an email when this item becomes available. Although you will be immediately notified when we have stock on hand, we will not reserve any units for you; you must return to our website and place an order.

+ Add to Wishlist
Add to Wishlist
Select Wish List:
Comments (up to 200 characters):
Quantity Desired:
Quantity Received:
Qualifies for Free Shipping!
FREE Shipping Promo offers FREE standard ground shipping via UPS on orders of $75 or more for orders containing non-overweight or oversize items (orders which do not qualify for our FREE shipping promotion will still be shipped at a discounted rate).

Terms and Exclusions:
  • Offer valid only on orders shipping within the contiguous United States. Orders shipping to Alaska, Hawaii, Puerto Rico, Guam or other US Territories do not qualify for this promotion.

  • This promotion does not apply to items requiring expedited shipping, such as refrigerated products, frozen products or live rock.

  •'s FREE shipping promotion does not include products sent in oversized or particularly heavy boxes. This may include but is not limited to aquariums, canopies, chillers, external water pumps, metal halide magnetic ballasts, stands and substrate/sand. These items may be subject to additional shipping handling charges. Should shipping surcharges apply, they will be noted on individual product pages and / or displayed during check-out. We will, however, pay a portion of the shipping charges for these orders.

  • Shipping surcharges, such as special handling are NOT covered under the FREE shipping promotion.

  • Shipping charges for returned merchandise is non-refundable. Please read's Return PolicyPolicy for more information.

  • Price matched (Low Price Guarantee) or discounted orders do NOT qualify for our free shipping promotion.
If you find a product we sell for a lower price at another online store, we will match their price to ensure you always pay the lowest amount when you shop with us.

Enter the price, shipping cost and website address where you found the lower price. Then click the "Add to Cart" button. We will review the lower price while processing your order and make any necessary reductions before your order ships. Some restrictions apply. See Terms & Conditions.
Shipping Cost*
Competitor's Website*
*Required information
Marine Depot 60-day Returns
At Marine Depot, we stand behind our products. That is why we offer a 60-day return period: one of the best in the industry! Learn More

Hanna Instruments Combination pH and ORP Tester Information

Product Manuals & Documentation

The newest member to Hanna instruments Combo series of combination waterproof testers with advanced functions is HI 98121, designed for simultaneous pH and ORP measurements.

HI 98121 also reads temperature, which is continuously displayed on the dual level LCD.

An encapsulated external stainless steel sensor, positioned in close proximity to the pH electrode provides fast response. A fiber junction can be easily pulled out and replenished. And when finally spent, the pH electrode cartridge can be quickly replaced with the supplied electrode removal tool, reducing waste and cost.

HI 98121 works with common batteries and when turned on, displays the percentage of remaining battery life. The stability indicator ensures reliable readings.

Ergonomically designed for ease in handling, this meter will float if inadvertently dropped into water.

*Please note: pH calibration is required prior to use.  ORP comes pre-calibrated straight from Hanna Instruments.

Manufacturer Info

Hanna Instruments USA Aquarium Supplies
Hanna Instruments is a leading manufacturer of analytical aquarium instrumentation. They were founded in 1978 and are headquartered in Woonsocket, Rhode Island. When Hanna introduced pH Electronic Paper in 1986 it literally revolutionized the world of testing by allowing millions of people in various industries to test for pH in a simple, accurate and affordable way. Hanna employees are constantly challenging themselves to improve on existing technology and to invent new testing techniques with the common goal to simplify analytical testing. This applies not only to instrumentation, but also to sensors development, reagents and chemicals. Hanna also believes in controlling the quality of their products from inception to delivery so they manufacture everything themselves, from meters and electrodes to chemical reagents and buffer solutions.

Hanna Instruments Combination pH and ORP Tester Reviews

Average Rating
(7 reviews)
Sort Reviews By:

Hanna PH & ORP Tester

Reviewers Rating Excellent!

Posted: 3/23/2012 from JERSEY CITY, NJ UNITED STATES
5.0 5
Experience Level: Intermediate

Comments: I have used this product in 2009 and I was happy with it. The instrument broke down on me after a long while because of no maintenance, I guess. (I really didn't know if there was one at all). So I upgraded to a PINPOINT ORP Monitor which is very cumbersome to use. Many times I knocked down the glasses that I use to do a demo with and spilled liquid on the table because I have to hold it with both hands. Now I am back to using the Hanna instrument.

4 of 4 People found this review helpful, did you? Yes No

Hanna ORP/pH Meter

Reviewers Rating Unsatisfactory

Posted: 12/20/2010 from Dunnellon, FL UNITED STATES
1.0 5
Experience Level: Beginner

Comments: I can't figure out how to calibrate the instrument, so I need to wait for an associate who understands it to return from the holidays. When she somes back and can advvise me, I will let you know if the meter works.

1 of 7 People found this review helpful, did you? Yes No

Great Product!

Reviewers Rating Excellent!

Posted: 9/12/2010 from Curitiba PR Brazil
5.0 5
Experience Level: Intermediate

Comments: Very Ease to use, and very acurate! Calibratin HP is very Easy! I Will only recommend to Hanna to build a more complete Manual, because there is some cares needed to the probe like, clean solution, and storage solution, that I did't found "how to use". And how to store the probe...wet or dry?

2 of 2 People found this review helpful, did you? Yes No


Reviewers Rating Average

Posted: 3/1/2010 from LINDEN, CA UNITED STATES
3.0 5
Experience Level: Beginner

Comments: I intended to use it during product presentations going from one glass of water to another testing the ORP. But it takes too long. I had seen another unit work much faster. I am not sure at this time if I will continue to use this unit or find the name of the other and go that way.

Did you find this review helpful? Yes No


Reviewers Rating Great

Posted: 3/9/2009 from SAN JOSE, CA UNITED STATES
4.0 5
Experience Level: Intermediate

Comments: THere is a question in my mind, if this meter is also design for drinking water testing. Please response. Overall I like it very much and very helpful in my business. I am into drinking water business.

3 of 4 People found this review helpful, did you? Yes No

Big Bang for the Bucks!

Reviewers Rating Excellent!

Posted: 5/6/2008 from REDDING, CA UNITED STATES
5.0 5
Experience Level: Expert

Comments: I bought this device to definitively prove the difference between regular drinking water and ionized drinking water, as I distribute Tyent water ionizers. People are fascinated by the negative ORP value that the Hanna tester demonstrates. The PH meter is equally useful, as ionized water has a much higher PH than "normal" drinking water. I have already recommended this instrument to several friends. It lists at about $150.00, and I have seen it for as much as $175.00, so a good deal is had here. Namaste - Baran

26 of 27 People found this review helpful, did you? Yes No

Hanna Combo ph+ORP

Reviewers Rating Excellent!

Posted: 2/28/2008 from ALBUQUERQUE, NM UNITED STATES
5.0 5
Experience Level: Beginner

Comments: very usefulI ordered two and then used both to find the info/reading was different.Called customer service and was refered to Hanna who explained about calibrating the devicesback to Marine cust service/tech support and ordered calibration solutionsSo far I am impressed with the ease of use but maybe an asterick would be helpful to know to order calibration solution when you order the meter - I am new at this and didn't know.Great customer service and tech support at Marine Depot!

42 of 45 People found this review helpful, did you? Yes No

Try these related products

WIN A $499 ANGEL LED! Sign up for our best deals, how-to videos and a chance to win a Euroquatics A1P Angel LED!