My daughter Chloe didn't last long in the baby bathtub since she was a big baby, but this Aqua Scale 3-in-1 Baby Bath Tub, Scale and Water Thermometer, Blue ($69 on Amazon) would have been so helpful the first six weeks as we were monitoring her baby weight to make sure she was taking in enough breast-milk. Lilsugar seems to think this could be too much for our generation of worrysome parents but the reality is otherwise. For some parents of newborns, having a scale is necessary such as for preemies or babies who may be having feeding-issues. I know of some parents who end up renting them for a month or two to save themselves time running back to Day One Center (a place in the Bay Area for parents/babies) or the pediatrician's office to weigh. I say whatever you can do to make the first few months easier for everyone – all the better.
The temperature display shows how warm the water is and also displays the baby's weight in pounds and ounces (or kilograms if you prefer).
One tip for baby bathing, I bought an extra four-sided changing pad to use on the floor. I would lay a towel over it so I could just carry my baby up and place her on the towel and get her dry quickly. I would place all her clothing and diaper next to the floor. It made bathtime a breeze and kept Chloe warm. I felt it was too drafty to change her back in her room.