Nine-volt battery batteries were formerly made in this size. They had higher capacity than the then-standard carbon-zinc types, a nominal voltage of 8.4 volts, and very stable voltage. Once used in photographic and measuring instruments or long-life applications, they are no longer manufactured as mercury is highly toxic and accumulates in the ecosystem, posing a risk to humans and wildlife. Most battery voltage testers and chargers that can also test nine-volt need another snap clip to hold the battery, while cylindrical batteries often share a holder that may be adjustable in size. Because of the proximity of the positive and negative terminals
Risk and Safety Statements in the course of harmonising classification, labelling and packaging of chemicals by introduction of the UN Globally Harmonized System of Classification and Labelling of Chemicals (GHS). The R/S statement code for fuming hydrochloric acid (37%): The corresponding English language phrases: Dashes separate the phrase numbers. They are not to be confused with range indicators. Slashes indicate fixed combinations of single phrases. More detailed hazard and safety information can be found in the material safety data sheets (MSDS) of a compound. Risk and Safety Statements Risk and Safety Statements, also known as R/S statements, R/S numbers, R/S phrases, and R/S sentences,