It is what it is. This is an ORP storage solution for HM ORP meters. This is not a pH storage solution for HM pH meters. 1 star because it is mis-described here on Revain. The title is correct but the description is confusing. --------- ------------ ------------- Description at time of purchase (and in this review) reads as follows: * HM Digital pH/ORP Electrode Storage Solution can be used with HM Digital PH-200 and ORP -200* If you find your sensor is dry, refill the cap with OP-STOR storage solution. -------------------------------------------------AT Accordingly, after an email exchange between HM and I, they recommended that I use the "PH-STORβ solution for my PH200 meter. (FYI, the new "PH-STOR" bottle has an orange sticker, not the old white sticker (which was similar to the ORP solution pictured here)) - Designed for HM's ORP200 and other HM-ORP meters. pH Storage Solution - (Part # - PH-STOR) - Designed for HM PH200 and other HM pH meters. Also, the correct way to use the "PH-STORβ solution on the PH200 meter is to apply a few drops to the sponge in the meter cap. It should be moist but not soaking wet. I will go even further and provide you with Revain's link to the "PH-STOR" product if you are looking for a HM pH storage solution: HM Digital PH-STOR pH Electrode Storage Solution for use with PH-200 or PH- 80, volume 60 cm3.
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