Apera Instruments, AI213 Pocket Tester, TDS20 Value, Waterproof TDS, Complete Kit, Accuracy: 1% F.S, 0.5 Degree C

I have used this meter for 3 years so I can offer a reasoned assessment. The kit is thoughfully designed. The meter is reliable and accurate. It is waterproof. The default reading is in microsiemens, which I much prefer to ppm, but the the meter can convert and present the reading in ppm if required. I would suggest checking the accuracy immediately using the provided 1413 microsiemens calibration fluid. Then I would suggest testing some distilled water - the reading should zero. Over time the meter will need to be recalibrated but this is a simple procedure using the 1413 calibration fluid. I own several professional conductivity meters made by WTW, Hanna and such like but they are stored in quite bulky professional cases and are equipped with separate electrodes whereas this meter is easy to access and to use being all of one piece and this is sometimes very handy. The meter can be slipped into pocket which the others cannot so it's convenient in many situations. I've used this one a fair bit in my work. The accuracy compares favourably with other meters which are many times more expensive. A useful and reliable tool, this is not a toy such as the many sub-£15 TDS meters one finds on sale. I don't think it would be suitable for professional use - the screen is rather small, for example. But it is fine as a backup device to use for quick checks. I would recommend this device to anyone looking for a reliable conductivity meter without investing in expensive professional equipment.

A very well made and accurate TDS meter, i have both this and their PH meter in this range. Ignore every other chinese PoS meter on this site and just pay a little more and get a good accurate German meter.

As title

Just to be clear straight from the off. This is a review of the Apera Instruments AI213 TDS meter. That's total dissolved solids. It does also show water temperature but this is NOT a pH meter, nor is it an EC meter (electrical conductivity - technically a TDS meter uses EC measurement to give a TDS result). For most applications you're probably going to want at least a separate pH meter. This comes in a well presented kit form, which includes the two calibration fluids required to calibrate the tester. Roughly speaking you're looking at a case about the size of an old Betamax tape but an inch and a half thick. Probably not the most useful size comparison, so 160x190mm. Instructions are included to set-up the meter, which requires several steps and both calibration solutions but it's actually pretty straight forward. There's a big difference between the total dissolved solids for hydroponics vs checking your pool water but there are several different ranges to accommodate this. Also, I don't have a pool so that solved that dilemma. I've been using a cheap TDS meter for my hydroponic solutions up til now and honestly I gave up on it as the results just didn't feel accurate and repeatable from one test to the next. I'm feeling a LOT more confident in the consistency of the results. On the other hand it's about five times the price of those other meters.

POCKET ======== The Apera Instruments TDS20 tester is an effective pocket tester. I tested: tap water : 150 ppm filtered water : 120 ppm bottled water: 0.8 ppm USE ==== It can be used for setting up hydroponics. WORKS ======= So far it works. If I have any issues I'll update the review

When I received the product it was quite easy to use, measurements seemed accurate to my inline professional meter. After 4 weeks blank screen of death, batteries supplied by the manufacturer had leaked and damaged the internals, no joy after replacing batteries. Will update once I can get hold of customer service

Purchased 2 of this both of them stopped working in less than 3 months can’t even return

Seems to work well and produce consistent readings. Well made and in a good box with calibration solutions. Good clear instructions and laminated guide.

TSDメーターを2本持っていますが、測定結果の差にひらきがあり過ぎるので、この商品を購入しました。 購入するに当たっては、pHメーター（PH-20）を持っていて精度も良かったのと、自分で校正出来る点を考慮して決めました。 購入したばかりなので耐久性は分かりませんが、測定結果は満足いくものでした。 校正の手順も、クイックマニュアルに図解で説明があり分かりやすかったです。

Facile à calibrer, donne une bonne lecture

I love this thing. It’s easy to use, easy to calibrate. Nice little case, reasonable price. I use it to measure the total dissolved solids for an aquarium.

Mesure simple et rapide, contrôle et étalonnage aisé sans devoir jouer du tournevis grâce a la reconnaissance digitale et les solutions d'étalonnage livrées dans le coffret.

No vienen instrucciones en español