Dive Computer Expert Reviews
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Tusa IQ–750 Element II was made as a further advancement and ‘step up’ dive computer from previous model IQ-650. It gained many brand-new features and doesn’t resemble its predecessor at all. IQ–750 has dual gas and switching gases functions, audio alarms, backlight and PC download options, air and nitrox, freedive and gauge dive modes.
This instrument is recommended dive computer as for beginners and advanced divers who want to stretch their diving activities to deeper depths and get flexibility of using this dive equipment in different dive modes.
As in the case with Tusa IQ–650, we may create 2 consoles with Tusa IQ–750 dive computer. The first one is SCA–252 with IQ–750 and pressure gauge, the second is SCA–352 with dive computer, pressure gauge and compass.
Copy this Tusa IQ-750 Element Features & Alarms Card for your Reference and Share with your friends and buddies!
Above mentioned alarms are for Air and Nitrox dive modes, Freedive mode has its own alarms and we will discuss them later.
As I said above Tusa IQ–750 Element II has 3 control buttons: MODE, ADVANCE, and SELECT. Using them we will manage our diving and adjust all parameters. Front buttons are big and easy to press regardless of what thickness gloves we wear, side button may be harder to press with thick gloves.
But before you need to devote some time to learn how to use those buttons. It may be confusing for the first and maybe even second time.
Tusa IQ–750 has 3 bar graphs to represent some dive data graphically. Below you may see short descriptions for each of them:
It is worth to mention that display for each dive mode has main and alternative screens with additional dive data and if you need – it easy to swap displays just by pressing Advance button.
Front control buttons are big and easy to press, but you may find difficulties to press side button if you dive in cold waters and wear thick gloves.
During pre-diving, usually we set and check parameters and I may tell that Tusa IQ-750 has many of them to satisfy demands the most capricious diver!
All parameters are divided into 4 groups – setting FO2s, setting Alarms, Utilities and Time.
Copy this Tusa Element II IQ-750 Fine-Tuning Card for your Reference and Share with your friends and buddies!
Tusa IQ-750 Element II: Diving With Air & Nitrox
Copy this Tusa Element II IQ-750 No-Decompression Displays Card for your Reference and Share with your friends and buddies!
If you we set it for Air – dive computer, obviously, won’t display values related to Nitrox and O2BG may not be displayed as well, but everything else is similar.
Tusa IQ-750 scuba dive computer displays No-Decompression (NDC) Dive Time Remaining by monitoring your current depth, oxygen accumulation, no-decompression status. It shows you not only your Dive Time Remaining (DTR) at certain depth in minutes, but also displays status of NiBG or O2BG (in Nitrox mode) by adding or taking away segments of those graphs.
When we dive with compressed air – we have 79% of nitrogen and 21% of oxygen approximately. If this is the case – our tissues absorb nitrogen and Dive Time Remaining (DTR) is shown according to nitrogen loading.
When we dive with Nitrox – it is a different case. We have different percentage of nitrogen and oxygen and our body responds differently to such a gas mix. In this case we are exposed to oxygen toxicity. If oxygen exposure reaches maximum allowed limit – Tusa IQ–750 will display O2 icon and Dive Time Remaining will be displayed regarding to O2 calculations.
Diving with Nitrox has its own peculiar properties!
If you set Deep and Safety Stops functions to ON, upon reaching certain conditions of dive, Tusa IQ–750 will give you corresponding stop prompts with all appropriate notations, icons and values, like: STOP icons, countdown timers, stop depths. This dive computer manages these stops and displays stop data similar to Oceanic dive computers.
In certain conditions dive computer gives High PO2 alarm (if ascended deeper than maximum operational depth according to FO2 and PO2 set) and High O2 alarm when maximum allowed level of oxygen toxicity was reached. And again, it has all appropriate notations, values and icons to assist us in these cases.
Almost missed to mention about Ascent Rate alarm – this thing will activate if you ascend faster than allowable maximum at certain depths. Tusa IQ–750 will flash with Ascent Rate Indicator full set of segments, notation SLOW and on top of that – audio goes on and on, until we slow down – it is pretty loud, so you won’t miss it!
As this dive computer has double nitrox gas feature – it has a function of switching gases during a single dive, of course. Just before doing this for the first time underwater – practice button combos on surface to be sure that you know what to press after what not to be confused later!
Tusa IQ–750 activates Decompression mode if we exceeded our No-Decompression Limits (NDLs) – depth and time. From this moment dive computer calculates all dive data according to this mode.
For managing Decompression Stops Tusa IQ-750 has comprehensive display:
During decompression we need to safely ascend to the deepest stop depth displayed and stay at that depth or slightly deeper until countdown reaches ‘zero’, then next shallower stop depth will be displayed and we have to proceed with the same process, and so on.
If any violations occurred during decompression procedure – Tusa IQ–750 will guide us very well through those conditions. It has special algorithm to calculate each violation whether you ascended shallower or found yourself much deeper (greater than 21 meters, for example).
Tusa IQ-750 Element II: Diving In GAUGE Mode
Next Dive mode that Tusa IQ–750 has – is Gauge mode. In this mode dive computer works as a depth gauge and timer and doesn’t perform calculations for No-Decompression times and depths.
Display layout has following attributes (main and secondary):
Tusa IQ-750 Element II: FREEdiving Mode
The last Dive mode of Tusa IQ–750 that we haven't mentioned yet, can be warmly welcomed by freediving guys, because it is dedicated Freedive mode.
If you are a freediver – you may be particularly interested in following functions for freediving:
After Transition period (10 minutes after dive) Tusa IQ-750 allows us accessing following functions:
Tusa IQ-750 Element II: What Divers Say
Tusa IQ-750 Element II is well suited for beginners who want to progress fast in diving career, advanced recreational divers, and freedivers.
I couldn’t say that I found any major problems with it and guys I met who used this dive instrument didn’t blame it any way. The only things that come to my mind and worth to say about – side button not easy to press with thick gloves and to get the most out of this dive computer - you need to set some time to read manuals and learn how to use it properly – and that’s about it.
I say it again that from the point of specs, features and price – Tusa IQ-750 Element II is perfect addition to your dive gear and you may use it as a primary instrument or as a backup.