The service provided by Aquaessentials - simply outstanding...
Ordered this product (lowest price on the net) late in the day but still arrived early next day. Well packaged.
IMO this product represents excellent value for money. It is solid, good looking, has an extra long sensor lead which is practical. The readout is large and clear. The backlight isn't very bright but I'm unlikley to use it.
The ALARM is loud and easily heard above normal household noise levels. You set the desired temperature to be monitored and the unit automatically assigns upper and lower values which will trigger the alarm.
The readout scale is selectable. I chose Fahrenheit and with this setting found the alarm triggers at plus/minus 0.9 degrees
The Set-up instructions are confusing and could be better. Battery is included.
I recently suffered losses after a faulty heater 'boiled' the water. My previous digital thermometer didn't have an alarm so the ETI with it's ALARM FEATURE is a very cheap form of insurance against this happening again.
Accuracy: I have compared the readings of this product and two other digital brands - all three read within 0.1F of each other.
I would have awarded a full set of stars but reluctantly, I dropped one star as the set-up instructions whilst detailed, are poorly written and difficult to follow.
Set-up took about 15 minutes (the main ambiguity is the function of the red button on the back of the unit). However, once set-up was completed the instructions made perfect sense!
My ETI has been in use for a week os so - no problems...
I removed the sensor whilst carrying out some tank maintenance and overlooked the alarm feature but within a few minutes it went off due to slight temperature drop.
Overall, an EXCELLENT product - no hesitation in recommending this one - Get it bought!