Science2Education HI-701 Hanna Instruments Free Chlorine Checker, 0.00 ppm to 2.50ppm

very simple to use a accurate, a good instrument

UPDATE: June 2019: I switched to using LaMotte DPD1 tablets as more consistently accurate than 'Total'. I also use instrument grade' test tablets NOT 'visual grade'. ------------------------------- Bought to use with salt-based indoor pool. Works fine. Hanna reagents are expensive but comparison testing shows it works fine with Total Pool DPD 1 Comparator/Rapid Tablets (100 for £5.99 elsewhere on web). Only one cap is included for use with cuvettes (vials). Replacements are extortionate. Recommend following procedure: Fill both cuvettes with sample, cap one cuvette and add reagent to the other. Carry out testing as described in manual. Switch cap to second cuvette before insertion in tester.

Easy to use DosE wot it says will be buying the nitrate next

Very good product

Muss Geduld haben damit umzugehen.Hatte noch keine Zeit

It's our second tester. We used the other for 3 years 4 times a day. Great investment

Molto preciso e utile. L'ideale è usarlo insieme al metodo tradionale basato sui colori. Così si é sicuri di tenere sempre sotto controllo la clorazione dell'acqua

Some instruments are purposely limited to encourage additional purchases. I believe this is one of those instruments. It appears there are several wavelengths and times for different measurements. The wavelengths are determined by the LED color while a resistor in the base of the unit apparently determines the countdown time. In summary, it means a single unit can be used to measure multiple parameters as long as the reagents and reaction times are correct. With two cuvettes, the free chlorine checker can be used for both free and total chlorine as well as other 525nm based tests. I tried this with free chlorine and total chlorine tests and think it is an excellent alternative to Taylor test kits. The Taylor kits (K2005 in particular) require matching light shades of pink to determine chlorine levels. Even holding up to light is not always conclusive and the measurement tolerance is roughly ±0.5 PPM. This meter yields an easy to read number. All the difficulties of pouring the reagent and setting the timer are eliminated if the user simply takes two samples, uses one as the control, and then manually times the wait period (1 minute for free chlorine, 2.5 minutes for total chlorine). Just before the time is completed, put in the unreacted sample, let the unit take the baseline measurement, and then insert the reacted sample and let the checker do its magic. I compared the results to the Taylor test kit and obtained relatively similar readings. The Taylor test kit I have is quite old and the reagents are well past expired (thus the reason for buying this checker). I also used this checker with the Taylor reagents and also obtained relatively similar readings. I purchased 100 test packs for both free and total chlorine so I am set for a while. Note that the Hanna reagents require pH less than 8.2. My pH was high and I did not get useable readings until I lowered the pH to below 8.0. This tester may also be used with other 525nm tests. I have a saltwater aquarium and wanted to check the phosphate/phosphorus levels. The HI 736-25 phosphorus reagents) measured 0.70 PPM. I don't have any algae problems so this seems reasonable. I recently ordered the HI 713-25 phosphate reagents and will compare the readings. I also have some HI 721-25 iron reagents but have not tested with it yet. If anything, I might recommend the Hanna Instruments HI 711 Total Chlorine checker for its 3.50 PPM range. The HI 701 is limited to 2.50 PPM. Both have 0.01 PPM resolution and ±0.03 PPM accuracy.

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