What a sweet refrigerant scale! After unboxing, I installed the included 9v battery (which has a little, molded place to keep a spare 9v battery in the case), zeroed the scale, and checked to see how sensitive the scale is using the scale's included pamphlet. Using the ounces setting, the scale is sensitive enough that a person could use it for weighing mail. I also grabbed a full 25-pound bottle of 410A refrigerant which weighs just under 35 pounds and messed around with the scale's position in its case—that is flat in the case, and with the scale half in and half out of the case and the bottle of refrigerant weighed the same. The reading on the scale tells you if the weight is stable or not as well with a tattle-tail stable light (see photos). I checked the accuracy of this refrigerant scale against a clunkier scale that I (have been) using to measure pounds of refrigerant for charging and this scale was spot on with my old scale. The scale has three unit types: ounces, kilograms, and pounds. The scale also has a backlight that stays on when turned on, and off when turned off in case you're working in a lower light area. I also really like the scale's case. The case is slim, and has the nicer-style plastic latches that work better and are more secure than the one-piece blow-molded case latches. All to say that I really like this scale!