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Your cart is empty.Milwaukee MA887 Digital Salinity Refractometer with Automatic Temperature Compensation, Yellow LED, 0 to 50 PSU, +/-2 PSU Accuracy, 1 PSU Resolution has a number of industrial applications. Samples are measured after a simple user calibration with distilled or deionized water. Within seconds, the refractive index and temperature are measured and converted into one of three popular measurement units; Practical Salinity Units (PSU), Salinity in parts per thousand(ppt), or Specific Gravity (S.G. (20/20))
Kindle Customer
2025-09-02 14:14:04
I don't get excited over new gadgets very often, but this tool is awesome. I am new to salt water aquariums and needed help with maintaining the correct specific gravity for my sea anemones. This meter has been accurate every time I have used it.
Dotti
2025-08-28 13:56:40
Accurate, easy to use, easy to calibrate. It has made the testing process for my salt water reef tank so easy! Look no further!
Customer
2025-08-22 13:10:52
We have a small educational aquarium with around 25 tanks and our staff uses this daily. It is very easy to use and holds up pretty well with all the use. It is easy to store based off size. Water stays on reader and is easily cleaned off. This is a good value for all the benefits it provides. The dark color helps hide any blemishes from wear and tear.
alex smith
2025-08-20 11:49:51
i got this at someone's recommendation. i must say i was pleasantly surprised. I'm 6 months in, and its still going strong. i highly recommend though for anyone with any refractometers, to buy here on amazon a refractometer calibration liquid set at 1.026 just so you can always know with certainty. i mean its nice to know your refractometer is still accurate.
Wendy
2025-08-18 11:50:46
I heard a lot of good things about this refractometer. I ordered mine just over a month ago. I was a little disconcerted that testing against 35ppt calibration solution would show 1.025 SG, but discovered that if I filled the well up to almost overflowing it would read correctly. At that point I figured it was just user error.It now shows my tank is down from 1.026 to 1.022. That kind of change doesn't happen overnight on a 260G tank, so I checked it against my optical refractometer, which read 1.026. Since there's no way to calibrate the MA887 except at 1.000 SG, the thing is useless.
littlebeard
2025-08-11 10:09:15
This device seems very accurate for me. I have several calibration fluids for my refractometers, however the calibration fluid that was sent says 1.025, when measured it reads as 1.026. My handheld reads the same. My other calibration fluids that are 1.0264 read at 1.026. I believe the calibration fluid is not accurate. I did indeed shake up the fluid and this device is brand new, so the fluid was not sitting around un-opened.I enjoy this device as I have a tough time reading (seeing as I wear glasses) my handheld ones.
BadddDoggg
2025-07-19 10:07:36
I struggled with small cheap plastic hydrometers for many years and I've always doubted their accuracy, mainly because of air bubbles and degradation of the plastic as it ages. I've seen people use the optical ones but they are always pointing them at the room light to try to get a reading. It's nice to have something really accurate for a change that you can read in any light, I especially like that it takes into account the temperature! I'm amazed at the low price, this could easliy sell for $300 or more. It's really fast and easy to use. If there was one thing I could change it would be that I wish it had one more decimal place so you can tell if it's between for instance 1.023 and 1.024. If it read 1.0235 that would be awesome, but realistically the small changes in salinity between numbers won't have an effect on your aquarium.For those new at changing water I can share my method. I have a 14 gallon nano cube and I change 2 gallons twice a week. I measure out my water in gallon water jugs, similar to milk jugs only they had distilled water in them. I fill them with RODI water for my salt mix. Then I weight out 293 grams of Kent Marine Reef Salt Mix using a gram scale. That brings the salinity to 1.024 (263 grams will bring it to 1.021). Then I pour one gallon of water in a five gallon plastic jug, pour in the salt, cap and invert to mix several times. Then I pour in the last gallon rinsing out my salt container in the process, cap and invert to mix again. This initial mixing puts most of the salt into solution. Then I add a small powerhead and aquarium heater for a few hours and everything goes into solution without any further mixing. Then using two other gallon jugs I empty out exactly two gallons and pour in the fresh saltwater. Works like a charm!
Verna May Briones
2025-07-16 20:16:21
So I thought my MA887 was deviating by up to 2 PPT. Upon further research, I found out that the calibration solution used to verify the reading is bad. Made my own calibration solution instead by mixing 3.65g of Iodine salt with 96.35g (or ml) of distilled water (dont use RO/DI since RODI itself has a reading of 1-3ppt) and verified that the MA887 I got was very accurate. Great product!
Hans-Peter Rosker
2025-07-06 10:48:59
Alles bestens OK.
Mohammed S.
2025-06-13 15:44:49
Fantastic piece of equipment every marine keeper should own it ,Will not let you down accurate measurements very easy to use.
Raul Navarrete C.
2025-05-30 15:50:07
Gracias por el envió en buenas condiciones a equipo amazon y proveedor. El paquete está en buenas condiciones y el contenido bien envuelto y protegido. De comienzo todo bien, se recomienda este equipo. Es el segundo refractometro que compro, ambos funcionando muy bienContiene 2 pipetas2 soluciones quÃmicas para calibrar1 baterÃa de 9 vcd1 manual de usuario
OT
2025-05-28 14:30:16
Great device, if you are keeping Reef aqurium you should have one. Works as advertised, extremely easy to use, come with 0ppm calibration solution and 35ppm controll sample, 2 pipets for sampling + batteries for device it self. Not cheapest option on the market but with high value corals in our tanks price is comparable to brand name see true type refractometers. Highly recommended!!!
W
2025-05-16 12:25:17
Box was crushed and there was scratch mark on the product. Test solution was leaking. Looks like a used product which isn’t acceptable for the price.
Kindle Customer
2025-05-04 10:28:50
I don't get excited over new gadgets very often, but this tool is awesome. I am new to salt water aquariums and needed help with maintaining the correct specific gravity for my sea anemones. This meter has been accurate every time I have used it.
Dotti
2025-04-19 18:36:23
Accurate, easy to use, easy to calibrate. It has made the testing process for my salt water reef tank so easy! Look no further!
Customer
2025-04-18 14:35:58
We have a small educational aquarium with around 25 tanks and our staff uses this daily. It is very easy to use and holds up pretty well with all the use. It is easy to store based off size. Water stays on reader and is easily cleaned off. This is a good value for all the benefits it provides. The dark color helps hide any blemishes from wear and tear.
alex smith
2025-03-29 20:18:44
i got this at someone's recommendation. i must say i was pleasantly surprised. I'm 6 months in, and its still going strong. i highly recommend though for anyone with any refractometers, to buy here on amazon a refractometer calibration liquid set at 1.026 just so you can always know with certainty. i mean its nice to know your refractometer is still accurate.
Wendy
2025-03-28 12:17:55
I heard a lot of good things about this refractometer. I ordered mine just over a month ago. I was a little disconcerted that testing against 35ppt calibration solution would show 1.025 SG, but discovered that if I filled the well up to almost overflowing it would read correctly. At that point I figured it was just user error.It now shows my tank is down from 1.026 to 1.022. That kind of change doesn't happen overnight on a 260G tank, so I checked it against my optical refractometer, which read 1.026. Since there's no way to calibrate the MA887 except at 1.000 SG, the thing is useless.
littlebeard
2025-03-27 11:37:42
This device seems very accurate for me. I have several calibration fluids for my refractometers, however the calibration fluid that was sent says 1.025, when measured it reads as 1.026. My handheld reads the same. My other calibration fluids that are 1.0264 read at 1.026. I believe the calibration fluid is not accurate. I did indeed shake up the fluid and this device is brand new, so the fluid was not sitting around un-opened.I enjoy this device as I have a tough time reading (seeing as I wear glasses) my handheld ones.
BadddDoggg
2025-03-25 18:01:04
I struggled with small cheap plastic hydrometers for many years and I've always doubted their accuracy, mainly because of air bubbles and degradation of the plastic as it ages. I've seen people use the optical ones but they are always pointing them at the room light to try to get a reading. It's nice to have something really accurate for a change that you can read in any light, I especially like that it takes into account the temperature! I'm amazed at the low price, this could easliy sell for $300 or more. It's really fast and easy to use. If there was one thing I could change it would be that I wish it had one more decimal place so you can tell if it's between for instance 1.023 and 1.024. If it read 1.0235 that would be awesome, but realistically the small changes in salinity between numbers won't have an effect on your aquarium.For those new at changing water I can share my method. I have a 14 gallon nano cube and I change 2 gallons twice a week. I measure out my water in gallon water jugs, similar to milk jugs only they had distilled water in them. I fill them with RODI water for my salt mix. Then I weight out 293 grams of Kent Marine Reef Salt Mix using a gram scale. That brings the salinity to 1.024 (263 grams will bring it to 1.021). Then I pour one gallon of water in a five gallon plastic jug, pour in the salt, cap and invert to mix several times. Then I pour in the last gallon rinsing out my salt container in the process, cap and invert to mix again. This initial mixing puts most of the salt into solution. Then I add a small powerhead and aquarium heater for a few hours and everything goes into solution without any further mixing. Then using two other gallon jugs I empty out exactly two gallons and pour in the fresh saltwater. Works like a charm!
Verna May Briones
2025-03-18 13:50:46
So I thought my MA887 was deviating by up to 2 PPT. Upon further research, I found out that the calibration solution used to verify the reading is bad. Made my own calibration solution instead by mixing 3.65g of Iodine salt with 96.35g (or ml) of distilled water (dont use RO/DI since RODI itself has a reading of 1-3ppt) and verified that the MA887 I got was very accurate. Great product!
Hans-Peter Rosker
2025-03-13 19:03:18
Alles bestens OK.
Mohammed S.
2025-01-10 18:42:17
Fantastic piece of equipment every marine keeper should own it ,Will not let you down accurate measurements very easy to use.
Raul Navarrete C.
2025-01-08 14:58:05
Gracias por el envió en buenas condiciones a equipo amazon y proveedor. El paquete está en buenas condiciones y el contenido bien envuelto y protegido. De comienzo todo bien, se recomienda este equipo. Es el segundo refractometro que compro, ambos funcionando muy bienContiene 2 pipetas2 soluciones quÃmicas para calibrar1 baterÃa de 9 vcd1 manual de usuario
OT
2024-12-30 16:06:51
Great device, if you are keeping Reef aqurium you should have one. Works as advertised, extremely easy to use, come with 0ppm calibration solution and 35ppm controll sample, 2 pipets for sampling + batteries for device it self. Not cheapest option on the market but with high value corals in our tanks price is comparable to brand name see true type refractometers. Highly recommended!!!
W
2024-12-27 13:35:01
Box was crushed and there was scratch mark on the product. Test solution was leaking. Looks like a used product which isn’t acceptable for the price.
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