TyrePal Solar 4 Tyre Pressure Monitoring System TPMS with 4 sensors ****Auto Express Recommended TPMS for 2017***

On a friend's recommendation, I have fitted these to my Adria Izola motorhome. They are simple to fit - previous versions used a tiny allen screw to lock to the schraeder valve thread, but these use a conventional brass locknut for security. This seems to require a special spanner (supplied) to fit and remove the sensor. I suspect this is a more robust arrangement and less prone to seizing up, than the fiddly allen screws..The system has a 'base' unit that just sits wherever you want (e.g. on top of fascia) on a reasonably flat surface, and has a silicone non-slip mat to sit on. It is solar powered, and can also be charged via USB. The wheel sensors seem to seal really well. I have one quite battered valve that wasn't replaced when I had new tyres fitted. I fully expected this to leak, but no - seems perfectly airtight.The unit can be set up to monitor up to 5 wheels on this model, so will cover the spare, although a 5th sensor is not supplied. Other models will cover more wheels, to include a trailer, or tag axle set-ups.The unit needs setting up to the set tyre pressures and also to the acceptable deviation from this setting, for high and low alarms. There are also alarms for high tyre temperatures, so the information is very comprehensive. The base unit sits in sleep mode until it senses movement, as do the wheel sensors. After a few metres driving, it all comes to life and performs very consistently. It is worth noting that tyre pressures vary considerably with running time and ambient temperature, so setting the alarms for + or - 5 psi, based on cold pressures will almost invariably scare the bejasus out of you on a warm day after a 70 mph run. I'd advise +10 and - 5psi to minimise nuisance alarms. The sensors have replaceable button cell batteries and seem well made. Time will tell how long the units and the batteries will last. The sensors can be bought separately, if you get a failure. All in all, this seems an excellent product and a very useful safety aid.

Great idea but no good if you put a sealant into your tyres

Hvae had a previous version which worked well but they then seized to the wheel and the MOT tester couldn't take them off (not actually an MOT check).Bought the newer one which looks less likely to have the smame problem since the valves are fitted with a "boot" to fit over the valve and some warning about lubrication is given..Have had some problems getting the monitor to monitor and charge but when sent back it has been given an all clear.

Review left having messaged seller over a month ago and not receiving a reply...Purchased this following someone driving my car with a near flat tyre which cost £90 to fix, in theory all it needs to do is save me one flat tyre and it will have paid for itself. Gives that bit of reassurance nothing is wrong when you get in the car as you can't always see a semi deflated tyre when approaching your car.Its a good product, when it works. All 4 wheels show on the display when first starting the car but despite no low battery warnings or other errors it will start dropping tyres while driving. I'll occasionally have 3 still showing on the display at the end of my 20 mile commute but more often than not only one shows - doesn't seem to be the same tyres remaining on screen so cannot diagnose an individual broken sensor.

Had to replace one of the sensor batteries,but other than that works as expected. The sensors are kind of big, but not really that noticeable.

**UPDATED** After a few more days with the item it seems that the unit does indeed automatically turn itself on/off UNLESS you turn it off manually. If you do turn it off manually you bypass the automatic feature and the only way to get it working again is to let it turn off by itself again. The manufacturer also confirmed this after I contacted them. This is not explained in the instructions hence why it didn't seem to work. **UPDATED** After my initial 3 star review because of the problems mentioned in the next paragraph, I updated my rating to 5 stars because the auto-on/off feature seems to have started working for some reason. The only real complain I now have, besides the sticky pad issue and the unnecessary logo in the sensors, is that you have to drive for a few kilometers for the sensor reading to show up on the monitor and not all the sensors "wake up" at the same time.I would like to rate this item five stars but the auto-on/off according to movement feature is not working. Everything else works fine. I think there is room for improvement in the printing of the brand logo in the sensors (white letters on black background makes an unnecessary call to action to theft) and in quality of the sticky pad that holds the monitor in place (it should stick to the car but actually sticks to the monitor when you remove it). But overall the system works very well.

The setting instructions are not included in the delivery pack. The process is a complete mystery. If wrongly set up, you can not reset and start again. Too clever by half. Expensive junk, avoid.

Fitted to my motor home. Gives me piece of mind regarding the pressureand just as importantly the temperature of the tyres.However difficult to read display and it has to be carefully positioned to read all tyres.after six months the battery has now stopped holding its charge so will have to return it