Thermal printers that never need ink.

A thermal printer prints by heating tiny dots on its print head against heat-sensitive paper, which darkens where it is heated. There is no ink, toner or ribbon — the image is formed by heat alone, so paper is the only consumable. It is what prints your shop receipt, a bus ticket and a courier label.

No. A thermal printer has no ink, no toner and no cartridge. It burns the image into heat-sensitive paper, so the only running cost is the paper roll — typically a few thousand rupees a year, even on a busy counter.

Three real ones. Thermal prints fade — the paper is sensitive to heat and light, so a receipt left in sunlight or a hot car will darken or go blank. It prints in one colour only, so no colour graphics. And it needs thermal paper; it cannot print on ordinary paper. For receipts, tickets and labels — where the print only has to last months, not decades — none of these matter much, which is why nearly every retail counter uses one anyway.

A typical thermal receipt stays legible for roughly six months to a few years, depending on how it is stored. Kept cool, dark and dry it lasts longer; heat, sunlight, humidity and friction all shorten it. For anything you must keep long-term, such as GST records, rely on the digital copy rather than the paper slip.

The receipt from a supermarket till, a bus or parking ticket, a courier shipping label and an ATM slip are all thermal prints. Anywhere you see a fast, inkless, single-colour print on slightly glossy paper, a thermal printer made it.

If the printer sits on a counter beside a computer or POS, choose an 80 mm receipt printer — the TP909-U (USB) or the TP909-UL, which adds LAN so you can place it anywhere on the network. If you print on the move, for field sales, delivery or van distribution, choose a Bluetooth thermal printer that pairs with an Android phone: the BTP120 (2-inch, most pocketable) or the BTP320 and BTP-3N (3-inch, wider bills). Prices start at ₹5,999 + GST.

The paper width. A 2-inch (58 mm) printer produces a narrow, pocket-sized receipt and the smallest body — best when you carry it all day. A 3-inch (80 mm) printer prints a wider bill that fits more items per line, which is the standard for retail counters and restaurant KOTs.

Almost certainly. Every NGX thermal printer speaks ESC/POS, the standard command set that virtually all billing software uses, and the range ships with an Android SDK for custom apps. The TP909 printers carry drivers for Windows, Linux, Android and Mac.