- Non-clogging double junction pH electrode for prolonging meter life
- Automatic calibration and temperature compensation for ease of use
- Self-check and stability indicator to indicate when to take a reading
- Large LCD screen for readability
- 12 Vdc power adapter for prolonged use
Specifications for this item
- Brand Name
- Hanna Instruments
- Mfr Part #
- HI 991404
- Pkg Qty
- 1
- EAN
- 0870883005115
- Item Weight
- 2.3 pounds
- UPC
- 870883005115
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Product Details
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Product Description
The HI 991404 pH/Ec/TDS/Temperature meter is a multi-parameter device for monitoring nutrient parameters in hydroponics, greenhouses, and horticultural applications.
Featuring a large easy-to-read LCD screen, automatic calibration and temperature compensation, the tester provides fast and accurate pH, electro-conductivity (EC), Total Dissolved Solids (TDS) and temperature readings. A self-check assures the device is in working condition, while the internal stability feature indicates when to take a reading. A hold function allows the user to freeze the display in order to record results. The HI 991404 also features a non-clogging double junction pH electrode and a conductivity probe.
The HI 991404 tester measures temperatures of 0.0 to 60.0 degrees C (32 to 140 degrees F) + or - 0.5 degrees C (+ or - 1 degrees F)/RH max 95% (+ or - 0.1 degrees C / 0.1 degrees F), and has a range of 0.0 to 14.0 pH (+ or - 0.1) with a resolution of 0.1 pH. EC range is 0 to 3999uS/cm (+ or - 2% F.S), with a resolution of 1uS/cm. TDS range is 0 to 2000pp(mg/L) (+ or - 2% F.S), with a resolution of 1ppm. The EC/TDS conversion factor is adjustable from 0.45 to 1.00. The device has an input impedance of 1E12 Ohm and operates on a 12 Vdc power adapter. The dimensions are 160 x 105 x 31 mm (6.3 x 4.1 x 1.2") and it weighs 190 g (6.7 oz.), a conveniently sized meter for taking measurements in the field.
pH testers measure the acidity or alkalinity of a substance and are commonly used by researchers, manufacturers, and hobbyists.
Hanna Instruments manufactures a wide variety of analytical instrumentation, including pH meters, multi-parameter meters, electrodes, chemical reagents and buffer solutions. Founded in 1978, Hanna is headquartered in Woonsocket, RI, with subsidiaries in 32 countries. Hanna Instruments holds many firsts in the field of analytical instrumentation, including a pH electrode with a built-in temperature sensor, an electronic pocket-sized pH tester, and a replaceable electrode pH pocket tester. To ensure the quality of their products, Hanna is a vertically integrated manufacturer and does not subcontract any part of its manufacturing.
What’s in the Box?
- HI 1293D pH electrode
- HI 7630 probe
- pH and EC calibration solutions
- 12 Vdc power adapter
- Instructions
Customer Reviews
Most Helpful Customer Reviews
18 of 18 people found the following review helpful
Had this unit for a few months now, and have been a more than a little disappointed with it.
First the good:
1. Back lit screen makes it easy to read in dark locations.
2. The EC/TDS meter works well and is easy to calibrate.
3. The temperature meter (built in to the EC/TDS probe) is also accurate on my unit.
4.The unit has mounting screws
5. The probes have threads for inserting into a closed system
6. Great email response from the service team
Ok Now the bad!
1. The pH probe has a non-standard plug, so you can only use this probe type. Other units use a standard BNC connector and your probe choice can be based on durability, maintenance and accuracy requirements.
2. When calibrating, you need to place both probes (pH and EC) into the calibrating solution - this means more calibration solution is wasted rinsing and submerging probes. - You will want a good 100mls of solution each time you calibrate.
3. The pH probe seems very delicate with a very poor shelf/operating life - I have tried 2 new pH probes and neither work properly. The probe it came with was dry (in the plastic bulb protector) on arrival and it had a metering range of 7.2 to 7.0. I replaced this probe for a second one (~$75) which fortunately arrived wet. This new probe reads a 4.01 solution as pH5.4 - an improvement on the first but still useless.
4. Performing two point calibration at 7.0 and 4.0 is impossible, as this unit has automatic calibration. I was told by Hanna that if the probe is not reading your 4.0 solution within a few points of 4.0, it will not set!!
Unfortunately neither of my 2 probes come close to reading a 4.01 solution anywhere near this. Hanna's opinion on this is that if the probe wont do this, it is broken!!
On other pH meters you can set the 2nd set point (ie pH 4 or 10) by turning a screw or dial somewhere on the unit. Not so on these units.
5. The unit is very sensitive to current changes on the power board. If you have multiple devices that are being switched on and off on the same power board, your HI991404 meter unit will turn off as soon as one of the other devices switches on. Unfortunately, the Hanna meter does not turn itself back on again. I have tried changing the power transformer from 12v 0.5amp to a 12v 1.5 amp regulated (important) and EMI filtered, transformer. This solves the problem, but you will need to re calibrate the meter as the readings (esp. EC) will be slightly different. This suggests to me that there is no power regulation with this unit, and it is supplied with a very cheap transformer.
6. The EC/TDS/Temp probe is hardwired to the unit. If these fail, the unit has to go in the bin. Fortunately this EC/Temp probe is robust and the unit will probably fail first. Which brings me to the final issue
This last point is just nit picking but the unit looks good in the picture but feels light and plasticy when you have it in hand. when mine arrived, all of the screws were loose, and there is an abundance of vacant realestate inside the unit. Im sure with a little thought, they could have easily halved the size.
These criticisms are based on my experiences with a Milwaukee SMS122 and another "no brand" continuous pH monitor, and a Hanna handheld pH meter. The 2 Hanna meters have both been junk.
Recommendations:
1. Look for a meter that has replaceable, BNC connector, probes.
2. Consider getting a meter that is compatible with Gel filled pH probes
3. Avoid automatic calibrating units.
4. Cheap no name brands can be more reliable than expensive brands
First the good:
1. Back lit screen makes it easy to read in dark locations.
2. The EC/TDS meter works well and is easy to calibrate.
3. The temperature meter (built in to the EC/TDS probe) is also accurate on my unit.
4.The unit has mounting screws
5. The probes have threads for inserting into a closed system
6. Great email response from the service team
Ok Now the bad!
1. The pH probe has a non-standard plug, so you can only use this probe type. Other units use a standard BNC connector and your probe choice can be based on durability, maintenance and accuracy requirements.
2. When calibrating, you need to place both probes (pH and EC) into the calibrating solution - this means more calibration solution is wasted rinsing and submerging probes. - You will want a good 100mls of solution each time you calibrate.
3. The pH probe seems very delicate with a very poor shelf/operating life - I have tried 2 new pH probes and neither work properly. The probe it came with was dry (in the plastic bulb protector) on arrival and it had a metering range of 7.2 to 7.0. I replaced this probe for a second one (~$75) which fortunately arrived wet. This new probe reads a 4.01 solution as pH5.4 - an improvement on the first but still useless.
4. Performing two point calibration at 7.0 and 4.0 is impossible, as this unit has automatic calibration. I was told by Hanna that if the probe is not reading your 4.0 solution within a few points of 4.0, it will not set!!
Unfortunately neither of my 2 probes come close to reading a 4.01 solution anywhere near this. Hanna's opinion on this is that if the probe wont do this, it is broken!!
On other pH meters you can set the 2nd set point (ie pH 4 or 10) by turning a screw or dial somewhere on the unit. Not so on these units.
5. The unit is very sensitive to current changes on the power board. If you have multiple devices that are being switched on and off on the same power board, your HI991404 meter unit will turn off as soon as one of the other devices switches on. Unfortunately, the Hanna meter does not turn itself back on again. I have tried changing the power transformer from 12v 0.5amp to a 12v 1.5 amp regulated (important) and EMI filtered, transformer. This solves the problem, but you will need to re calibrate the meter as the readings (esp. EC) will be slightly different. This suggests to me that there is no power regulation with this unit, and it is supplied with a very cheap transformer.
6. The EC/TDS/Temp probe is hardwired to the unit. If these fail, the unit has to go in the bin. Fortunately this EC/Temp probe is robust and the unit will probably fail first. Which brings me to the final issue
This last point is just nit picking but the unit looks good in the picture but feels light and plasticy when you have it in hand. when mine arrived, all of the screws were loose, and there is an abundance of vacant realestate inside the unit. Im sure with a little thought, they could have easily halved the size.
These criticisms are based on my experiences with a Milwaukee SMS122 and another "no brand" continuous pH monitor, and a Hanna handheld pH meter. The 2 Hanna meters have both been junk.
Recommendations:
1. Look for a meter that has replaceable, BNC connector, probes.
2. Consider getting a meter that is compatible with Gel filled pH probes
3. Avoid automatic calibrating units.
4. Cheap no name brands can be more reliable than expensive brands
12 of 15 people found the following review helpful
I got this unit and tried for days to get it to work, so I called the company Hanna and they told me you are not supose to put the probes in past the top, it doesnt say nothing about this in the directions, then the other thing is this unit won't work around a electronic ballast. Hanna should do there home work and let people know this stuff.Hanna Gro'Chek Continuous pH/TDS/EC/Temp
2 of 2 people found the following review helpful
I Ordered this item based on reviews of hanna products and thought this should most definatly suit me for my purposes. Upon arrival all packaging was in good condition with no damage. I set my meter up to the best of my ability however the ph meter would not calibrate. I used the device regardless and hoped that maybe it was an error on my part. After about a week of use the monitor stopped being continuos and started not being anything. Its just hanging on the wall , it shuts off immediatly after being turned on and does nothing but glow a green led light. This is a peice..if I ever saw one this is it. I contacted the Hanna tech dept. They asked a few questions and havent responded since. Overall I believe they hype their own products. This was a poor decision on my part..dont make the same mistake.
Most Recent Customer Reviews
Thought it would work
I purchased 2 of the Hanna combo grochek meters last year which are supposed to have a 2 year warranty, but the first one already is off and wont re-calibrate. Read more
Published 12 months ago by Mya
Decent pH/Conductivity/Temperature Meter
This meter has worked reasonably well in an aquarium system, maintaining a pretty good calibration over time. Read more
Published 22 months ago by James Snyder
Very accurate product, but a poor choice for gardeners with a lot of...
This pH meter is very accurate and not too hard to use, but it will not work at all if there are electrical appliances running near by. Read more
Published on March 23, 2010 by Frequent Amazon Shopper
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