Just got this email from Hanna Instruments
The HI 755 Alkalinity Checker HC features an accuracy of ±5% of reading ±5 ppm and uses the colorimetric method and only sells for $49.50. Visit www.hannachecker.com to get yours today!
It reads in ppm so divided by 50 (or multiply by .02) for meq/L or multiply the meq/L rading by 2.8 for dKH
e.g the video shows a reading of 170 (ppm)
170 ppm / 50 = 3.4 meq/L * 2.8 = 9.52 dKH
They changed the auto time off from 2 minutes to 10 minutes.
SPECIFICATIONS HI 755 (Alkalinity)
±5% of reading ±5 ppm @ 25°C
0 to 50°C (32 to 122°F); RH max 95% non-condensing
(1) 1.5V AAA
After 10 minutes of non-use
81.5 x 61 x 37.5 mm (3.2 x 2.4 x 1.5”)
64 g (2.25 oz.)
Method Colorimetric method
I love the phosphate checker (though I wish it had the 10 minute time out), but not sure how I feel about this over a Salifert kit.
If I buy one, I'll post a review.